- unknown directive: ''
- 未知: unknown
- 的: 4次方是 The fourth power of 2 i ...
- 指令: instruct; order; direct inst ...
- 未知的: sealed; unbeknown; uncharted; undiscovered; unfound; unheard; unk unknown; unkwn. unknown; unsuspected
- 未知的未知数: unknown unknowns
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