He wanted to rasp the surface smooth.

他想把表面锉平。

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Now you have to pull it to make the surface smooth like that.

现在你再把它推过去，让表面像那边一样的光滑。

youdao

In the choice of lemon, you must select the surface smooth and shiny, yellow.

在选择柠檬时，必须选表面光滑有光泽，黄色的。

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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

耶鲁公开课 - 基础物理课程节选

If checkerboarding does not work out, AkzoNobel has an alternative: create a surface so smooth that barnacles cannot hold on to it.

ECONOMIST: Monitor: Reducing the barnacle bill | The

Windows are clustered together in one corner, while the rest of the gray surface is smooth, except where broken here and there by what look like square openings.

CNN: AFTER THE BANG

It was all reflected in the smooth surface of the water, coloured a coffee-black by tannins released from decaying plant life below.

BBC: Taming the heart of the Peruvian Amazon