One em is the width and height of one “m” character (using whatever font size a website is set to).

1em正好是一个“m”字符的宽度和高度(而无论你的网站使用多大的字号)。

youdao

The "Nouns Plus Measure" phrases in ancient Chinese are the omitted form of descriptive "N- Num (One) - M" structure, not the calculative one.

上古时期的“名·量”式结构是作为描写性质而非计算性质的“名·-·量”结构的省略形式。

youdao

I'm Faith Lapidus. One of the world's great natural wonders is in the state of New Mexico, in the American Southwest.

VOA: special.2010.01.04

Host: So I understand we have time for one more question and I'm going to take the liberty since I'm sitting here to ask it.

主持人：我想还有时间再问一个问题,还是我来问吧，反正都坐这儿了。

斯坦福公开课 - 微软CEO-Steve.Ballmer谈科技的未来课程节选

So I think it's nice in that... for example, if I'm discussing philosophy with one of my friends

所以我觉得这一点很好……比如，如果我跟一位朋友讨论哲学，

对于未来的技术 - SpeakingMax英语口语达人

Though there is only one M.

FORBES: How To Get Into Business School

Mr. MEAD: Well, the thing is, you have to remember that I'm, you know, I'm the mummy that cooked the dinner, and I'm the one that planned the owl party, and I'm the one making the ice cream treats, so the costume's got to be on the simple side.

NPR: Author Shares Tricks And Treats For All

Fifty-eight years after its founding, Playboy is back to being what it started as: the private property of one Hugh M.

FORBES: Playboy Goes Private in $207 Million Deal