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入る時は

when entering

→ 入る
phrase Rare #28,959
when entering Literally means “when entering”; は marks the situation as the topic. It is often followed by a request, instruction, or rule about what to do when entering.
JA: 教室に入る時は、静かにしてください。
EN: Please be quiet when entering the classroom.

トイレに入る時はノックしてね。

Please knock before entering the bathroom, okay?

組織に入る時はよく調べろ

Do your research before joining an organization.

— マルコムＸ (1992)

入る時はノックしろ！

Knock before you come in!

— TAXi (1998)

室内に入る時は帽子をとりなさい。

Take off your hat when you enter a room.