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
You can take this job and shove it.
你把这份工作留着你自己干吧。
How did you decide that product was safe?
你怎样决定产品是安全的呢？
no more than one or twofeet thick.
气垫只有一两英尺厚。