Thicknesses
n. 层( thickness的复数形式 ); 浓度; 厚（度）; 最厚的部分
🗣️ 情景例句
before Michelle and her friends arrived.
在Michelle和她的朋友们来之前。
Discussing all these details will get us nowhere.
讨论这些枝节问题是完全没有用的。
When you have found a building in which to start your school.
你找到开办学校的楼房后