The facade of a Xi Guan house was generally built with grey bricks.

西关老屋的外表由灰砖组成。

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Suppose someone has been investing money for n years and xi is the return on the investment in a given year.

假设有人投资了n年,Xi是第i年的收益率

耶鲁公开课 - 金融市场课程节选

If you have a sample with n observations, it's the summation I = 1 to n of xi/n--that's the average.

如果你有n个观测值,对Xi从i=1到n求和再除以n

耶鲁公开课 - 金融市场课程节选

Football's world governing body wants to stop clubs fielding more than five non-nationals in a starting XI, a move the EU says would be illegal.

BBC: Fifa plans talks on player quotas

Scotland added a comprehensive 100-run victory over a TUKS Academy XI to a six-wicket triumph over TUKS CC, while they lost out to Gauteng Lions.

BBC: Scots upbeat on World Cup chances

The game will kick off a few hours before the start of the "90 Minutes for Mandela" match between an Africa XI and a Rest of the World XI at Cape Town's Newlands Stadium.

BBC: SPORT | Football | African | Fifa honours inmate footballers