let someone/something be
US /lɛt ˈsʌmˌwʌn ˈsʌmˌθɪŋ bi/
UK /lɛt ˈsʌmˌwʌn ˈsʌmˌθɪŋ bi/

1.
別管, 不打擾
to leave someone or something alone; to not disturb or interfere with someone or something
:
•
Just let him be; he's in a bad mood.
別管他了;他心情不好。
•
Please let the cat be; it's sleeping.
請別打擾那隻貓;它在睡覺。