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
Let me give you more detail.
让我来详细说明。
The doctor said it's just a mild cold, There's nothing to worry about.
医生说只是有点凉，不需要担心。
Mary is still writing letters. She's been writing letters all day.
马力还在写信，她写了一整天的信。