Probation period in Labor contract: no probation period for re-signed contracts; no longer than one month probation period for one-year-termed contract for fresh workers.

合同的试用期：老员工续签合同不应有试用期；新员工的合同期为一年的试用期不能超过一个月。

youdao

The labor contracts shall, after being signed, be filed with the local labor management department for the record.

劳动合同订立后，报当地劳动管理部门备案。

youdao

After buying National Steel last year, USS signed new labor contracts shrinking the combined domestic work force by 27%.

FORBES: Rusty SteelmakersTake a Shine