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笑ってしまう

can't help laughing

→ 笑う
phrase Rare #27,696
can't help laughing Often describes laughing involuntarily or before you mean to. The しまう can also add a sense of regret or that something happened completely.
JA: その動画を見ると、いつも笑ってしまう。
EN: I can't help laughing whenever I watch that video.

彼の漫画を読むといつも笑ってしまう。

I always end up laughing when I read his manga.

彼はよく自分で自分のジョークに笑ってしまう。

He often laughs at his own jokes.

彼の漫画を読むと、いつも笑ってしまう。

Whenever I read his manga, I can't help but laugh.