如果它想要纹理光滑一些，它就把身上的“触头”变得平整，这样它看上去就会很光滑，能够融入海底的沙地中。

If it wants to have a smooth texture, it flattens out the papillae, so it can acquire a smooth texture to blend in with the sandy bottom of the sea.

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底部不光滑的石头会留下直线划痕，而底部光滑的石头则会漂移，偏离原路。

Stones with rough bottoms leave straight tracks, while those with smooth bottoms drift and digress.

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此外，运用质量过关的光滑油以及按照厂商规则的维护周期对光滑油以及机油滤清器进行替换也是很要害的。

In addition, the use of quality clearance of smooth oil and in accordance with the rules of the manufacturer's maintenance cycle of smooth oil and oil filter replacement is also very important.

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You could take a continuous path, where you have an infinite equilibrium points in between the two, a smooth path, whereyoudrop pressureand temperature simultaneosly in little increments.

你可以选择光滑的连续路径，在初末态间有,无数个平衡态的点，压强和温度同时一点,一点地下降。

麻省理工公开课 - 热力学与动力学课程节选

Versus the car in 1990 new and shiny and smooth.

相比1990年的很新很光滑。

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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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