Ureas
尿素塑料(类)
🗣️ 情景例句
Three minutes to play.
还剩三分钟。
How people design computer games is beyond me.
我不懂得电脑游戏是怎么设计的。
Man-made satellites have been sent up into space by many countries.
许多国家都成功地把人造卫星送入了太空。