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入る時は

when entering

→ 入る
phrase Rare #30,303
when entering 時 means “when,” and は marks the situation being talked about. 入る means “to enter” or “to go in.”
JA: 部屋に入る時は、靴を脱いでください。
EN: Please take off your shoes when entering the room.

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.

トイレに入る時はノックしてね。

Please knock before entering the bathroom, okay?

入る時はノックしろと言ったろ！

I told you to knock when you come in!

— TAXi (1998)