Polyurea
[化] 聚脲
🗣️ 情景例句
We split up last week.
他们上星期分手了。
I'll pick up the tab.
我来付帐。
Speculations about is nature have been going on for literally thousands of years,
人们对睡眠作用的种种猜测，确实有数千年之久。