Passengers with hand luggage can go straight to the departure gate to check in there.

携带手提行李的乘客可以直接到登机口办理登机手续。

《柯林斯英汉双解大词典》

I only have thirty minutes to clear customs in getting to the city center and it means I have to check in by five-thirty, which means leaving home at about four fifteen.

我只有30分钟的时间来办理去市中心的海关手续，这意味着我必须在5点30分办理登机手续，也就是说我必须在4点15分左右离开家。

youdao

Good morning, I'd like to check in.

早上好，我想办理住房手续。

youdao

He gave it to Dupin. My friend examined the check carefully and put it in his pocket.

VOA: special.2009.12.26

I want you to check in with either Hillary or Lori There is a lecture now Monday, Wednesday and Friday at 11:00.

我希望你们和Hillary或Lori确认,上课时间是周一，周三和周五的11点。

麻省理工公开课 - 固态化学导论课程节选

First of all, having read in that value, I can check to see, is it of the right type?

首先，读一下这个值，我们可以来检查看看是不是正确的类型？

麻省理工公开课 - 计算机科学及编程导论课程节选

True, earlier this year, Forbes advised you to check in with a lawyer.

FORBES: See Your Estate Lawyer Now--If You Are Rich Or Frying A Turkey

Pickens used the pause in the schedule to check in with his traders in Dallas.

FORBES: Inside T. Boone Pickens' Brain

In January I tried to check in for a 6:00 a.m. flight from Philadelphia.

FORBES: The TSA's Fake Liquids Rule