试用期可以按照劳动合同签订期限来定义。

The probation period can be defined by contract deadline.

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但是仍然存在着一些有待进一步解决的问题，如拖欠工资、劳动合同签订率低等。

But there are still some problems to be resolved, such as non-payment of wages, the low rate of signed contracts and so on.

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该快餐连锁拒绝签订劳动合同、缴纳工伤保险，并且延长了试用期。

The fast-food chain has refused to sign labor contracts or insure employees against workplace injuries, and prolonged their probationary periods.

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