Some situations during which 唱歌
"Let it go
Let it go
Can't hold it back anymore"
would be dangerous:
1) When 你 或者 someone else is controlling his/her process of egestion 或者 excretion.
2) When someone's school bus get missed.
3) When someone is trying to stop vomiting during a bus journey.
4)When someone's pet bird fly away from owner.
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