Pka
[醫][=prekallikrein activator]前激肽釋放酶激活劑
??? 情景例句
You two must be close.
你們兩個關系一定很好。
I'm sorry, but I think she's stepped out.
對不起，我想她出去了。
You have to be able to check instructions.
你必須會查對說明。你必須會籌劃工作。