Selenopyrimidine
[化] 二嘧啶硒
??? 情景例句
I doubt it, sir. We'll try, but I can't promise anybody before 3:30.
我沒把握，先生。我們會盡早的，但我不敢許諾3：30以前行。
I see what a problem I have.
我遇到了個(gè)大問題。
We have a problem with your order.
你訂的貨有點(diǎn)問題。