The simplest example of this is in the polite request. 最简单的例子出自于礼貌的要求 If you express your request as a conditional -- "if you could open the window, that would be great" 倘若你用一个条件句表达请求：“您要是能开一下窗子就太好了，”

so that your home does not contribute to an overdose, 因此你的家里不会导致用药过量， or create or fuel an abuse or addiction problem. 或者助长药物滥用和成瘾问题。 Protect your friends, protect your family, protect your loved ones

【Speech Video】 President Obama remembers those who have given their lives for their country and praises those who serve in our Armed Forces. The President delivered the remarks at Andrews Air Force Ba

Now, you might wonder, "Come on, how much could five percentage points of global electricity be?" 现在你可能会问，“拜托，全球5%的电力能有多少？” Well, it turns out to be quite a bit. 事实证明还蛮多的。 It's the equivalent of 60 nu

Remarks of President Barack ObamaSaturday, May 15, 2010Weekly AddressWashington, DC On Thursday, I paid a visit to a small business in Buffalo, New York, a town that’s been hard hit in recent de