M-f
[医][=(male/female)ratio]男女比率，男女比例
🗣️ 情景例句
Excuse me, ma'am.
对不起 夫人
It is one thing to speak much and another to speak pertinently.
话讲得多是一回事，讲得恰当是另一回事。
You must cut off one pound of flesh, no more, no less. And not one drop of blood must fall.
你必须割下整一磅肉，不准多也不准少。而且不准流一滴血。