Mef
abbr. maximal expiratory flow 最大呼气流量
🗣️ 情景例句
The evening newspaper is cheaper than the morning paper.
晚报比早报要便宜。
You should wear a raincoat, It's rainy today.
你应该穿一件雨衣，因为今天下雨。
We offered them food and spoke to them kindly, but they remained motionless.
我们给他们东西吃，客客气气地同他们交谈，但他们却一动也不动。