Polymer degradation
[化] 聚合物降解
🧩 词语组成解析
🗣️ 情景例句
By arranging with the public schools
首先， 从公立学校开始
I will take a subway.
我将去搭地铁。
When it has been decided where we are going to drill, we put up at the surface an oil derrick.
当确定钻孔地点后，我们就在那里竖起一个井架。