Normally, bubbles of gas contained in ordinary water have smooth surfaces.

通常情况下，气泡是一种表面光滑，并富含水的水泡。

But not every smooth surface acts like a mirror.

但并不是每一个光滑的表面都像镜子一样。

Why is it that smooth surfaces can reflect images back at us?

为什么光滑的表面可以将图像反射回来呢？

Any smooth surface that can bounce back light, can be used as a mirror.

任何可以反射光线的光滑表面都可以用作镜子。

A bright red spot appeared on its smooth surface, like a ruby on Parian marble.

平滑的皮肤上，有一个鲜红的血斑，像是帕罗斯大理石上的一块红宝石。

But here's the interesting bit: bats never smashed into a smooth horizontal surface.

蝙蝠从来不会撞到光滑的水平面。

Dry erase markers are designed to write on smooth, hard surfaces and erase without a trace.

干擦记号笔设计用于在光滑、坚硬的表面上书写，而且擦除之后不留痕迹。

End modules with wheels instead of feet allow the robot to move faster on smooth surfaces.

末端模块有轮子，而不是脚，这样机器人就能在光滑表面上更快地运动。

Also, fibrillations form, essentially these cracks or clefts, on what used to be a smooth articular surface.

软骨纤维性颤动也将形成，其本质是这些原本十分光滑的软骨表面出现裂缝或裂口。

Use a produce brush on rough surfaces like melons and rub smooth surfaces, like apples, with your hands.

像瓜类这种表皮粗糙的水果，可以用农产品专用刷子来刷洗；苹果等外表光滑的水果可以用手搓洗。

The fibers for worsted yarn are long and lie nearly parallel, and when woven, have a smooth surface.

精纺毛纱的纤维很长，几乎平行排列，织造时表面光滑。

If the smooth surface absorbs the photons instead of bouncing them back, there's no reflection.

如果光滑的表面吸收光子，而不是将它们反弹回来，那就没有反射。

So, a contact lens does start to break down over time so it doesn't have a smooth surface.

所以，隐形眼镜就会开始慢慢破裂，然后它的表面就不会那么平滑。

Glancing out of his window, Harry saw the smooth, black, glassy surface of the water, a mile below.

哈利瞥了一眼窗外，看见了一英里之下平静漆黑、光滑如镜的水面。

This perceptual glitch meant that in lab tests 90 percent of bats banged into a smooth vertical surface.

这种感知故障意味着，在实验室测试中90%的蝙蝠会撞到光滑的垂直面。

The first is simple: look for a leafy tree that casts a shadow on a smooth surface.

找棵能在光滑表面上投出阴影的茂盛大树。

CSIs use their trusty brush and a palette of fingerprint powders to visualize prints from both smooth and textured surfaces.

犯罪现场调查人员使用他们可靠的刷子和指纹粉来观察光滑和有纹理的表面上的指纹。

Hold it between the sun and a smooth, solid surface to see the progress of the moon across the sun.

把它放在太阳和一个光滑固体表面之间，可以看到月亮穿过太阳的全过程。

They're waiting for the chemists to design new, smooth surfaces with increased inherent adhesion for some of those copper wires.

他们在等化学家们为某些铜线设计出增加了固有粘着力的新的、光滑的表面。

Smooth down all the surfaces before you start painting.

【smooth】上油漆前把全部表面都磨平整。