Talk very briefly about innovation cycles, things that grow, have a lot of activity; they die out when they're replaced by something else. 简短地谈一下发明创造的周期，周期发展时会衍生许多活动，当这些活动被其他活动取代，此周期就灭亡了。 These things

Now around Chernobyl, there are scattered ghost villages, 如今切尔诺贝利附近到处是毫无人烟的村庄， eerily silent, strangely charming, bucolic, totally contaminated. 静得吓人，诡谲迷人的气息，一片荒芜，完全受到污染。 Many were bulldozed under at

We have historical records that allow us to know how the ancient Greeks dressed, 我们有历史纪录可循，可以让我们知道古希腊人如何穿着、 how they lived, how they fought, but how did they think? 如何生活、如何打仗，但他们如何思考呢？ One natural ide

REMARKS BY THE PRESIDENT AT NATURALIZATION CEREMONY FOR ACTIVE DUTY SERVICE MEMBERS East Room 1:27 P.M. EDT THE PRESIDENT: Thank you. Thank you so much. This is a lot of fun. This makes so much of the

The eight-hour workday, 40-hour workweek, weekends. Overtime and the minimum wage. Safer workplaces. Health insurance, Social Security, Medicare, and retirement plans. All of those gains were fought f