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actinide

/ˈæktɪnaɪd/

Meanings
noun

锕系元素

Any of the 14 radioactive elements of the periodic table that are positioned under the lanthanides, to which they have similar chemistry.

Examples :

"Uranium, an actinide, is a heavy metal used in some power plants. "
铀是一种锕系元素，是一种重金属，被用于一些发电厂。
element chemistry science

Related Words

Illustration radioactive

radioactive noun

/ˌɹeɪdioʊˈaktɪv/ /ˌɹeɪdioʊˈæktɪv/

放射性物质，放射物

"The radioactive was carefully stored in a lead-lined container at the science lab. "

科学实验室里，那些放射性物质被小心地储存在一个铅衬容器中。

Illustration lanthanides

lanthanides noun

/ˈlænθənaɪdz/

镧系元素

"Chemists studying the properties of the lanthanides group them together because these elements behave similarly in chemical reactions. "

化学家在研究镧系元素的性质时，通常将它们归为一组，因为这些元素在化学反应中的表现非常相似。

Illustration table

table noun

/ˈteɪbəl/

桌子，台子

"The family ate dinner around the large wooden table. "

一家人围坐在那张大的木头桌子旁吃晚饭。

Illustration plants

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。

Illustration chemistry

chemistry noun

/ˈkɛm.ɪ.stɹi/

化学，化学科学。

"The chemistry class focused on how different elements combine to form new substances. "

化学课的重点是不同的元素如何结合形成新的物质。

Illustration positioned

positioned verb

/pəˈzɪʃənd/ /pəˈzɪʃənd/

放置，安放。

"The teacher positioned the globe on the table so the students could see it easily. "

老师把地球仪放在桌子上，这样学生们就能很容易地看到了。

Illustration under

under adjective

/ˈʊndə/ /ˈʌndə(ɹ)/ /ˈʌndɚ/

下的，底下的

"The under-the-counter storage bin kept the extra supplies hidden. "

那个在台面下的储物箱把多余的补给品藏了起来。

Illustration periodic

periodic adjective

/ˌpɪə-/ /ˌpɪɹiˈɑdɪk/ /ˌpɜːɹaɪˈɒdɪk/

周期性的，定期的。

"My doctor recommended periodic checkups for good health. "

为了身体健康，我的医生建议我定期进行体检。

Illustration which

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。

Illustration elements

elements noun

/ˈel.ɪ.mənts/

要素, 成分

"Letters are the elements of written language."

字母是书面语言的基本要素。

Illustration similar

similar noun

/ˈsɪmələ/ /ˈsɪməlɚ/

类似物，相似之处。

"The teacher praised the students' similar answers on the math quiz. "

老师表扬了学生们数学测验中相似的答案。(Lǎoshī biǎoyáng le xuéshengmen shùxué cèyàn zhōng xiāngsì de dá'àn.)

Illustration uranium

uranium noun

/jʊˈɹeɪniəm/

铀, 铀元素

"Nuclear power plants use uranium to generate electricity. "

核电站使用铀来发电。