Endothelin
內皮縮血管肽
??? 情景例句
Sure.
當然。
Yes, but I don't want go downtown.
是的，但是我不希望上街。
'It's working all right, but I'm afraid that at one o'clock it will strike thirteen times and there's nothing I can do about it.
“不錯，鐘能報時了，但是，恐怕每到1點鐘，它總要敲13下，對此我已無能為力了。”