Nadal will be officially named the number one tennis player in the world on August 18, ending Swiss Roger Federer's four-year stay at the top of the world rankings.

8月18日，纳达尔将正式成为世界排名第一的网球选手，终结了罗杰·费德勒保持长达四年的世界第一历史。

youdao

The number of stay-at-home moms, meanwhile, dropped last year for a fourth year in a row to 5 million, or roughly one in four married-couple households.

同时，去年是家庭主妇人数持续减少的第四年，跌至500万人，即大约四分之一的已婚家庭还有家庭主妇。

youdao

“Rule number one is to take immediate measures so you can stay in the game, ” says Mike Speiser of Sutter Hill Ventures, another VC firm.

“第一条规则就是采取直接措施以留在游戏中，”另一家风投公司Sutter Hill Ventures的麦克·斯佩瑟说。

youdao

That's how we stay number one.

WHITEHOUSE: Remarks by the President in Golden, CO

At the BPI, Sarah Roberts insists the old-style singles chart is not dead - if a single is good enough, it will stay at number one, even if it costs twice as much to buy eight days after it is released.

BBC: Keeping music alive

He immediately shot up to number one, where I expect he will stay if he and the campaign can work out the early kinks.

FORBES: Who Would Rick Perry Choose for Vice President?