caffeine

/ˈkæfiːn/

Meanings

noun

咖啡因

An alkaloid, C8H10N4O2, found naturally in tea and coffee plants which acts as a mild stimulant on the central nervous system.

Examples :

"Many students drink coffee for the caffeine to help them stay awake and study. "

很多学生为了靠咖啡因提神，保持清醒以便学习，所以喝咖啡。

Related Words

drink verb

/dɹɪŋk/

喝，饮用。

"He drank the water I gave him."

他喝了我给他的水。

found verb

/faʊnd/

发现，碰到

"While walking to school, Sarah found a lost wallet on the ground. "

莎拉在上学的路上，偶然在地上发现了一个丢失的钱包。

naturally adverb

/ˈnætʃ(ə)ɹəli/

自然地，天生地，顺理成章地

"Although he was unused to the situation, he tried to act naturally."

尽管他不习惯这种情况，但他还是努力表现得很自然。

students noun

/ˈstjuːdn̩ts/ /ˈstudn̩ts/

学生，学员

"He is a student of life."

他是一个在人生中不断学习的人。

stimulant noun

/ˈstɪmjələnt/ /ˈstɪmjʊlənt/

兴奋剂，刺激物

"Coffee is a stimulant that helps many students stay awake during late-night study sessions. "

咖啡是一种刺激物，很多学生靠它在深夜学习时保持清醒。

plants noun

/plɑːnts/ /plænts/

植物，草本植物

"The garden had a couple of trees, and a cluster of colourful plants around the border."

花园里有几棵树，边缘周围还有一簇簇色彩鲜艳的草本植物。

nervous adjective

/ˈnɜːvəs/ /ˈnɝːvəs/

神经的, 肌腱的

"The dancer's nervous muscles tensed before her performance. "

舞蹈演员演出前，她那些绷紧的、连接肌肉和骨骼的肌腱让她浑身紧张。

coffee noun

/ˈkɑ.fi/ /ˈkɒ.fi/ /ˈkɔ.fi/

咖啡，咖啡豆饮料

"My dad made a strong coffee before going to work. "

我爸爸上班前煮了一杯浓咖啡。

alkaloid noun

/ˈæl.kə.lɔɪd/

生物碱

"The coffee bean contains caffeine, which is a stimulating alkaloid. "

咖啡豆含有咖啡因，咖啡因是一种具有刺激作用的生物碱。

which pronoun

/wɪt͡ʃ/

哪个，哪些

"By now, you must surely know which is which."

到现在，你肯定应该知道哪个是哪个了吧。

system noun

/ˈsɪstəm/

系统，体系。

"There are eight planets in the solar system."

太阳系里有八颗行星。

central adjective

/ˈsɛntɹəl/

中心的，中央的。

"The central library is located in the heart of the city. "

中央图书馆位于市中心。