A bagel, a reasonable sized bagel's serving size is the size of a hockey puck.
百吉饼,合理的一餐份量应该是冰球大小
So again, you know, what hockey puck is this big?
你们知道,冰球大概是这么大
Somehow, if you could manufacture a really smooth frictionless surface, that if you took a hockey puck or something and an air cushion and you give it a push, in some idealized world, it'll travel forever.
如果你制造一个绝对光滑无摩擦的表面,然后在上面放个冰球或者别的什么,或者气垫,然后推它一下,在理想条件下,它会永远运动下去
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