名词
中文翻译：旅行许可
同义词：
['travel permit', 'travel authorization']
例句：
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1. To travel abroad, you need to apply for a travel authorization.
为了出国旅行，你需要申请旅行授权。
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2. The company requires all employees to have a valid travel authorization before leaving the office.
公司要求所有员工在离开办公室前必须持有有效的旅行授权。
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3. Without a valid travel authorization, they were denied entry into the country.
没有有效的旅行授权，他们被拒绝进入该国。