名词
中文翻译：检查者
同义词：
['ticket inspector', 'ticket collector']
例句：
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1.The checker at the train station was very helpful.
火车站的检票员非常乐于助人。
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2.The checker made sure everyone had their tickets before they could board the bus.
检票员确保每个人都持有车票，才能登车。
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3. The checker noticed that there were no tickets for the concert and informed the organizers.
检票员注意到音乐会没有门票，并通知了主办方。