ph.

登机时关于行李

在邮局

在机场

1. (在旅馆)登记入住;(在门诊部)挂号
When you check in or check into a hotel or clinic, or if someone checks you in, you arrive and go through the necessary procedures before you stay there.

2. (在机场)办理登机手续，检票登机
When you check in at an airport, you arrive and show your ticket before going on a flight.

1. announce one's arrival, e.g. at hotels or airports

Synonym: sign in