动词短语
中文翻译：签到
同义词：
['join', 'register', 'log in']
例句：
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1. The new employee had to sign on at the front desk.
新员工必须在前台签到。
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2. After signing on, she was assigned to a different department.
签到后，她被分配到了不同的部门。
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3. Before signing on, we need to fill out this form and provide our ID card.
在签到之前，我们需要填写表格并提供身份证。