找一些湿的东西遮住你的鼻子和嘴。
我们可以想象一块湿泥巴最后在火上烧制，烘干，变硬，形成一件形状中空的器皿，材料简陋，不过可以盛放东西。
We can imagine that a lump of wet clay somehow ended up in the fire, dried out, hardened and formed a hollow shape; a shape that could hold things, in a tough material.
第一步是要准备好你玩滑滑湿游戏的一些东西，《他紧随其后》的作者伊安·克纳博士说。
The first step is to prep for your slippery romp, says Ian Kerner, Ph.D., author of He Comes Next.
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