Researchers have used a new technique to hunt for rare genetic quirks that explain why some people are extremely fat or very thin.
研究者们使用了一种新的技术来探求罕见基因的特性，从而能够解释有些人非常胖而有些人则非常瘦。
It's not uncommon for people to grab some lunch and eat it in front of their computers, which was rare 20 years ago when I started working.
对现在的人来说，在电脑前吃午饭是很平常的事。但是，20年前我开始工作的时候，这种现象几乎不存在。
Some rare people are so filled with egotism that they imagine that they speak for all mankind.
很少有人会如此自负，自认为可以代表全人类。
Some rare people are so filled with egotism that they imagine that they speak for all mankind.
很少有人会如此自负，自认为可以代表全人类。
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