Pion
[化] π介子
🗣️ 情景例句
Attending school is compulsory in this country.
这国家衽的是义务教育。
How long will I have to wait?
我要等候多久呢？
Of course. And why not buy some English tapes and some books to go with them? I'm sure you'll find them useful.
当然了。干吗不买些英语磁带和与之配套的书呢？我相信你会觉得它们有用的。