基本解釋abbr.投資邊際效率（=marginal efficiency of investment）同根派生 MEI相關(guān)詞英漢例句From then on all the villagers talked about "our Doctor Mei". 從那時(shí)起，老鄉(xiāng)們都在談＂我們的梅大夫＂了。We all think Li Mei as a good girl. 我們都把李梅看作是一個(gè)好姑娘。Why couldn't Cousin Mei remarry? 梅表姐為什么不可以再嫁?Will Liu Mei fall into the river? 劉梅會掉進(jìn)河里嗎?Gradually, Mei's melancholy diminished. 梅的悲哀漸漸地減少了。MEI更多例句