check in
1. register in a hotel；report one's arrival 在旅馆登记住宿；报到；签到 如：
Have you checked in at the hotel yet？
你在旅馆登记住宿了吗？
The friends we had invited did not check in until Saturday．
我们邀请的朋友直到星期六才到达。
2. receive sth. that is returned and make a record of it 接收并登记（归还物品） 如：
I put the books on the library desk，and the librarian checked them in．
我把书放在图书馆的柜台上，图书管理员验收了这些书。
check out
1．pay the bill and leave 结帐离开 如：
Guests must check out before noon，or they will be charged for the day．
客人必须在中午前结帐离开，否则将付全日费用。
2．confirm by carefully checking 检验无误；核实 如：
The accountant checked out the bills and found them OK．
会计查对了帐单，发现正确无误。
Please check out each room to see if it is fit for a guest．
请检查每个房间看看是否适合客人住。
翻译以下句子：
①我们必须在8点到办公楼签到。
②我们付了旅馆费以后，就直接去飞机场了。
③请检验一下姓名和号码好吗？
④两小时前他们办理了离开手续。
Keys：
①We have to check in at the office building at 8∶00.
②We headed directly for the airport after we had checked out of the hotel．
③Would you check out these names and numbers，please？
④They checked out two hours ago．
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