求翻译：但必须在招用劳动者后三十天内依法与劳动者订立劳动合同，并在劳动合同订立十五天内将已订立劳动合同的职工花名册报给所在劳动局办事处备查。是什么意思？

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However, it must be in use within 30 days after workers in accordance with the law entered into labor contracts with workers, and in the labor contract within 15 days of the labor contract has been entered into trade unions roster has been reported to the labor board available at the office.

But must in incur latter in 30 days legally works out the work contract with the worker with the worker, and will work out in 15 days in the work contract to work out the work contract the staff name register newspaper to give reference in the labor bureau office.

But must be used within 30 days after the workers labor contracts with laborers according to the law, and has been at a labor contract within 15 days of the conclusion of labour contracts of roster of staff and workers to the labour offices for reference.

正在翻译，请等待...