There are two big classes in all kind of schools at present, first, the teaching mode regarding teacher as the center, second, the learning mode regarding student as the center.

目前各类学校中采用的教学模式主要有两大类，一是以教师为主的教学模式，二是以学生为主的教学模式。

youdao

The American,British and French leaders announced that Iran has been secretly building a second enrichment center for several years.

VOA: special.2009.09.26

Player II's payoff, from the same choices, top for Player I, center for Player II, again we go along the top row and the center column, but this time we choose Player II's payoff, which is the second payoff, so it's 3.

在这种情况下参与人II的收益,即参与人I 选上参与人II选中时,注意下是上行和中列,但是现在我们要找参与人II的收益,也就是第二个收益,即3

耶鲁公开课 - 博弈论课程节选

The second exhibit at the National Museum of American History is part of the museum's Archives Center.

VOA: special.2011.06.15

It was Ron Huldai, Tel Aviv's 13-year mayor and a former combat pilot, who, while London's Tech City was not even the subject of an interdepartmental memo, had got on with building a tech center second only to Silicon Valley.

WSJ: Tel Aviv Takes the Tech-Hub Crown

He also won the Kennedy Center's second Mark Twain Prize for Humor in 1999, a year after Richard Pryor.

WSJ: Comedian Jonathan Winters Dies

One would think a second center click would rid them of the overlay.

ENGADGET: Zune review