Polyvinyl
a. 聚乙烯基的
🗣️ 情景例句
and a decision to make.
而且必须做一个抉择。
That reminds me.
这使我想起来了。
It seems that man was making a real effort to understand the seasons 20,000 years earlier than has been supposed.
看来人类早就致力于探索四季变迁了，比人们想像的要早20，000年。