Polystream
多氯苯
🗣️ 情景例句
Okay. Thank you.
好的，谢谢。
And trade terminology in English is helpful in actual business negotiations.
对于实际的商务谈判是非常有用的。
A born teacher, she thought she could turn a deaf-blind person into a useful human being.
她是一个天的教师，认为自己可以把一个聋盲人变成一个有用的人。