check into

US /tʃek ˈɪntuː/
UK /tʃek ˈɪntuː/
"check into" picture
1.

入住, 办理登机手续

to register at a hotel or airport

:
We need to check into the hotel before 3 PM.
我们必须在下午3点前入住酒店。
Passengers are advised to check into their flights at least two hours before departure.
建议乘客在航班起飞前至少两小时办理登机手续
2.

调查, 查明

to investigate or examine something

:
The police are checking into the suspicious activity.
警方正在调查可疑活动。
I need to check into why the system crashed.
我需要调查系统崩溃的原因。