- 使: send; tell sb. to do sth.
- 悲伤: sad; sorrowful
- 的: 4次方是 The fourth power of 2 i ...
- 是: Semantics
- 悲伤的: distressing; fiddle-faced; grievous; heartbroken; melancholy; mirthless; rueful; sad; sorrowful; teary; woeful; woful
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