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A tongue-twister is a phrase that is designed to be difficult to articulate properly, and can be used as a type of spoken (or sung) word game.
If two witches were watching two watches, which witch would watch which watch?
如果两个女巫在看两块手表,哪个女巫在看哪块手表?
如果两个女巫在看两块手表,哪个女巫在看哪块手表?