此外，如果上衣是宽松式的，可以系腰带以凸显你的玲珑细腰！

Also, when the top has a loose fit add a belt to showcase your fabulous waistline!

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下承式系杆拱桥以系杆承受水平推力，属于无推力的组合体系拱结构。

A through tied-arch bridge is a type of built-up arch structure, characterized by the horizontal thrust of arch end being balanced by its ties.

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古希腊人坚信，我们所谓的太阳系实际上就是整个宇宙，并且宇宙以地球为中心。

The ancient Greeks believed that what we called the solar system was in fact the entire universe, and that the universe was geocentric.

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So this is our final equation, and this is actually called the Balmer series, which was named after Balmer, and this tells us the frequency of any of the lights where we start with an electron in some higher energy level and we drop down to an n final that's equal to 2.

把2代入到这里，所以得到1除以,这就是我们最终的方程，这叫做Balmer系，以Balmer名字命名的,它告诉我们从高能级掉到n等于2的,最终能级所发出光的频率。

麻省理工公开课 - 化学原理课程节选