Stm
[化] 掃描隧道顯微鏡
??? 情景例句
What's the matter?
到底發生了什么事？
I haven't heard from him for a long time.
我很久沒有收到他的信了。
That's a good idea! I'm sure she'll like it.
這是個好主意！我相信她會喜歡的。