On the surface, overtime is voluntary, but in fact there are implied standards for overtime.

表面上加班是自愿的，但事实上存在一些隐性标准。

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A contract may also be express, implied-in-fact, or implied-in-law.

合同也可以是明示的、事实默示或法律默示的。

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A contract may also be express, implied-in-fact, or implied-in-law.

合同也可以是明示的、事实默示或法律默示的。

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