我过着一种双面人的生活——表面上非常敬虔，看上去活得不赖，可是我里面却是装满地狱的黑暗。

I began to live a double life - a very religious person on the outside, with the appearance of a perfect life, but bearing hell inside of me.

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远古的天体碰撞可能诠释月球表面的双面特性。

An ancient collision may explain the moon's Janus faces.

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双面抛光已成为硅晶片的主要后续加工方法，但由于需要严格的加工条件，很难获得理想的超光滑表面。

Double sided polishing process has become a main machining method for silicon wafer finishing process, but it is difficult to get ultra-smooth surface with the very stringent machining conditions.

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