Concentration gradiant
[电] 浓度梯度
🧩 词语组成解析
🗣️ 情景例句
are going to spend a second honeymoon at the Watermill Inn.
将到Watermill Inn去度第二次蜜月。
The tour will take about an hour and a half. We ought to be back here by 3:00.
参观大概要一个半小时，3点钟以前回到这里。
What do you mean?
你这话是什么意思？