constant [ˈkɒnstənt]

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n.常数，恒量；adj.不变的，一定的，时常的

happening a lot or all the time

This suit has been in constant wear for two years. 这一套衣服已连续穿了两年。
An absolute constant is fixed and can not be changed. 绝对常数是固定而不可以改变的。