Concentration fluctuation
[建] 浓度升落
🧩 词语组成解析
fluctuation
[,flʌktʃʊ'eʃən]
n. 波动，涨落，起伏，[物]脉动;动摇不定，踌躇;[生]彷徨变异;
fluctu 波浪 + ation 表示行为、情况、状态、过程、结果 → n.波动, 起伏
🗣️ 情景例句
If you have something you want to talk about,
假如你有什么事情要谈，
Nightingales will not sing in a cage.
夜莺困笼不唱歌。
In the library she has got books on many different subjects.
在图书馆里她准备了各种科目的书籍。