4. 从后向前遍历原数组，按count位置放入结果数组
"The crew's doing great," Steve Stich, manager, Nasa's Commercial Crew Program, said at a news conference.
，这一点在Line官方版本下载中也有详细论述
arstechnica.com
The use of the word experience, rather than event or presentation, implies that Apple’s typical presentation format won't apply here. And CEO Tim Cook more or less confirmed this when he posted that the company had "a big week ahead," starting on Monday. Apple is most likely planning multiple days of product launches announced via press release on its Newsroom site, with the “experience” on Wednesday serving as a capper and a hands-on session for the media.