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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 can think of six thin things, but I can think of six thick things too.
我能想到六件薄薄的东西，但我也能想到六个厚厚的东西。
我能想到六件薄薄的东西，但我也能想到六个厚厚的东西。