常：每天下来挺忙碌的，但想起来可能都是一些平凡的小事。
Ms Chang: You are busy everyday, but your work are just some trival matters when you thought about them.
为了解决发动机凸轮、挺杆早期擦伤，常对其进行磷化处理。
Phosphating is usually applied to the cam and tappet of engine for the inhibition of early scratch.
那夫妻虽常吵架，但实际上他们互相挺相爱的。
The couple often quarrel, but in reality they love each other so much.
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