Plumosite
普通硫锑铅矿
🗣️ 情景例句
I need to fit a fourth operation into his schedule.
我得在他的工作表上再加第四个手术。
Who is this ,please?
请问你是哪一位？
it must be known to any kind of radio astronomer in the universe.
这个频率是宇宙中任何射电天文学家都应该熟悉的。