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
about your math teacher or your math homework.
你的数学老师或你的数学作业。
Love makes all hard hearts gentle.
爱情把一切冷酷的心变得温柔。
Sally was very excited because she had never travelled on a train before.
萨莉非常激动，因为她从未乘过火车。