Check in with your boss and coworkers as a courtesy to let them know you're back.

作为礼貌，与你的老板和同事打个招呼，让他们知道你回来了。

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Eg. As a courtesy to the next passenger, may we suggest that you wipe off the wash basin.

为了方便下一个乘客，我们建议你清洁洗手池。

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This message is provided as a courtesy to all guests regarding potential visa requirements.

此消息是免费提供的，给所有有潜在签证要求的客人。

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Frequent flier Ben Schlappig says he doesn't lean back in coach on daytime flights as a courtesy to others, but he doesn't expect anyone to return the favor.

CNN: Air rage: Is reclining your seat a right?

The official said the documents had been burned as a "courtesy" to IOC members.

CNN: TARNISHED RINGS

As a matter of courtesy, she went to Heath's office to tell him that she was putting up for his job.

WSJ: Paul Johnson: The World-Changing Margaret Thatcher