名词
中文翻译：劳动证明书
同义词：
['work certificate', 'employment certificate']
例句：
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1. To apply for a labor certificate, you must provide proof of your work experience and skills.
申请劳动证明书时，你必须提供工作经验和技能的证明。
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2.The company issued the labor certificate to its employees as a form of recognition.
公司为员工颁发了劳动证明书，作为对其的认可。
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3.The labor certificate is required for many jobs, especially those that involve heavy physical labor.
许多工作都需要劳动证明书，尤其是那些需要大量体力劳动的工作。