He rang the bell and asked for fresh flowers to be sent quickly to his rooms.

VOA: special.2009.04.11

How many of you have seen the Taco Bell series of advertisements for the fourth meal?

你们多少人看过塔可钟,宣传第四餐的那个系列的广告

耶鲁公开课 - 关于食物的心理学、生物学和政治学课程节选

So the normal--the bell-shaped curve in that case for the x/n is going to look something like this.

那么x/n的钟形曲线,大概就会是这个样子

耶鲁公开课 - 金融市场课程节选

The next year Bell moved to Boston,Massachusetts, to teach at a school for the deaf.

VOA: special.2010.05.14

For most of his life, Bell worked with deaf people.

VOA: special.2010.05.14

"For Whom the Bell Tolls."

VOA: special.2010.04.09

He rings this bell to collect money for the Salvation Army, a worldwide charitable Christian organization.

VOA: standard.2009.12.16

Many bell ringers are volunteers but others,like Green, work for a small hourly wage.

VOA: standard.2009.12.16