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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.
I wish to wish the wish you wish to wish, but if you wish the wish the witch wishes, I won't wish the wish you wish to wish.
我愿许你所许，若你的愿望太过虚幻不切实际，我就不会许你所许（我就不会和你一起天真的去幻想了）。