Check in (旅馆)登记；办理登机手续 They checked in at that hotel. 他们在那家旅馆登记入住了。 He had checked in at HongQiao airport for a flight to New York. 他在虹桥机场办理了飞往纽约的登机手续。 A:Good evening,sir,can I help you? 晚上好先生，我能为您效劳吗? B:Yes,I'd like to check in,please. 是的，我要办理入住登记。 A:Do you have a reservation? 您预定房间了吗? B:Yes,my name is Jack.I have a reservation for three nights. 是的，我叫杰克，我预定了三个晚上的房间。