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aa

/ˈɑː.ɑː/ /ˈɑ.ɑ/

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noun

阿阿熔岩

A form of lava flow associated with Hawaiian-type volcanoes, consisting of basaltic rock, usually dark-colored with a jagged and loose, clinkery surface. Compare pahoehoe.

Examples :

"Walking across the aa was difficult because its sharp, broken surface made every step painful. "

穿越阿阿熔岩非常困难，因为它锋利破碎的表面让每一步都疼痛难忍。

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noun

实际年龄

Initialism of acting age.

Examples :

"The casting director asked for the actress's resume, specifically noting her aa was sixteen, even though she was actually twenty-one. "

选角导演要了女演员的简历，特别指出她的实际年龄看起来像十六岁，即使她实际上已经二十一岁了。

entertainment age stage

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noun

A-a梯度，肺泡动脉。

Initialism of alveolar-arterial.

Examples :

"The doctor ordered a blood gas test to calculate the patient's AA gradient and assess their lung function. "

医生开了血气分析，以计算病人的A-a梯度，评估他们的肺功能。

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noun

约略绝对, 近似绝对

Initialism of approximate absolute.

Examples :

"The accountant estimated the building's value at $500,000, but added that this was an aa, subject to a professional appraisal. "

会计师估计这栋楼的价值为五十万美元，但补充说这只是一个约略绝对值，需要经过专业的评估才能确定。

technical science math

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noun

加速器，电枢加速器。

Initialism of armature accelerator.

Examples :

"The robotics team is working on improving the robot's speed by optimizing the AA during the motor calibration process. "

机器人团队正在努力通过优化电机校准过程中的电枢加速器(AA)来提高机器人的速度。

technology physics electronics machine

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noun

升主动脉，主动脉升部。

Initialism of ascending aorta.

Examples :

"The cardiologist pointed to the diagram, explaining that the AA carries blood directly from the heart. "

心脏科医生指着图表解释说，升主动脉（主动脉升部）直接将血液从心脏输送出去。

medicine anatomy organ body

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noun

原子吸收

Initialism of atomic absorption.

Examples :

"The lab technician used AA to determine the lead concentration in the water sample. "

实验室技术员使用原子吸收光谱法 (AA) 测定了水样品中的铅浓度。

chemistry science technical

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noun

作者修改，原作者修订

Initialism of author's alteration.

Examples :

""The editor flagged several instances of 'AA' in the manuscript, asking the author to clarify the changes made after the initial submission." "

编辑在手稿中标记了几处“作者修改（作者修订）”，要求作者说明最初提交后所做的修改。

writing grammar literature communication

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noun

平均观众，平均听众

Initialism of average audience.

Examples :

"The TV network increased its advertising rates after achieving a higher AA than expected in the target demographic. "

这家电视台在目标受众群体中获得了高于预期的平均观众人数，之后提高了广告费率。

media entertainment business

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adjective

极地高山的

Initialism of arctic-alpine.

Examples :

"The students researched the aa plant communities in their environmental science class. "

学生们在环境科学课上研究了极地高山植物群落。

environment nature biology

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adjective

始终漂浮的，永不下沉的

Initialism of always afloat.

Examples :

"The Coast Guard requires that all vessels contracted for emergency response be aa and ready for immediate deployment. "

海岸警卫队要求所有签订紧急响应合同的船只都必须始终漂浮，并随时准备好立即部署。

nautical sailing

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noun

醋酸

A clear colourless organic acid, CH3COOH, formed by the oxidation of ethanol; it is used as a solvent and has very many industrial applications; it is the major acidic component of vinegar.

Examples :

"To clean the coffee maker, she mixed aa with water. "

为了清洁咖啡机，她把醋酸和水混合在一起。

substance chemistry biochemistry food industry

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noun

氨基酸

Any organic compound containing both an amino and a carboxylic acid functional group.

Examples :

"Proteins are complex aas that are essential for building and repairing tissues in the body. "

蛋白质是复杂的氨基酸，对身体组织构建和修复至关重要。

biochemistry compound chemistry biology substance science

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noun

氨基酸

Any of the twenty naturally occurring α-amino acids (having the amino, and carboxylic acid groups on the same carbon atom), and a variety of side chains, that combine, via peptide bonds, to form proteins.

Examples :

"Nutritionists emphasize the importance of a balanced diet to ensure we get all the essential aa our bodies need to build and repair tissues. "

营养学家强调均衡饮食的重要性，以确保我们摄入身体所需的所有必需氨基酸，用于构建和修复组织。

biochemistry biology chemistry physiology substance structure medicine science organism

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noun

氨基丙酮

1-amino-2-propanone, a secondary amino ketone

Examples :

"Example Sentence: "In the chemistry lab, the researcher carefully synthesized aa (1-amino-2-propanone) as a key intermediate for the synthesis of a novel drug." "

在化学实验室里，研究人员小心翼翼地合成了氨基丙酮 (aa)，将其作为合成一种新型药物的关键中间体。

compound chemistry biochemistry

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noun

花生四烯酸

A long-chain polyunsaturated fatty acid, having 20 carbon atoms and four double bonds, found in animal fats; it is essential for human nutrition, being a precursor to the production of prostaglandins.

Examples :

"To maintain good health, it's important to include sources of AA in your diet, as it helps the body make substances important for regulating inflammation. "

为了保持健康，饮食中包含一些花生四烯酸（AA）的来源很重要，因为它有助于身体产生对调节炎症至关重要的物质。

biochemistry physiology medicine substance chemistry food biology science body

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adjective

等量的，各一份

Abbreviation of ana.

Examples :

"To ensure the pharmacist correctly dispenses equal parts of each ingredient, the prescription reads "Ingredient A 50mg, aa Ingredient B." "

为确保药剂师正确配发等量的各种成分，处方上写着“成分A 50毫克，另成分B等量”。