check into

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

入住, 辦理登機手續

to register at a hotel or airport

:
We need to check into the hotel before 3 PM.
我們必須在下午3點前入住酒店。
Passengers are advised to check into their flights at least two hours before departure.
建議乘客在航班起飛前至少兩小時辦理登機手續
2.

調查, 查明

to investigate or examine something

:
The police are checking into the suspicious activity.
警方正在調查可疑活動。
I need to check into why the system crashed.
我需要調查系統崩潰的原因。