Air surrounds Earth and becomes thinner farther from the surface.
空气包围着地球。离地表越远，空气越稀薄。
As your skin ages, it becomes thinner, loses elasticity, and stretches more easily.
当你皮肤变老的同时它变得更加稀薄，缺乏弹性，并且会更加容易伸缩。
When used at oblique Angle, the effective thickness of each layer becomes thinner than that at normal Angle.
当光线倾斜入射时，各层光学薄膜的有效厚度变薄。
As you age the skin under your eyes becomes thinner and the muscles less taunt, which can result in puffy under-eye bags.
随着年龄增长，我们眼周的皮肤会变薄，进而产生眼袋。
A telescope would have to be as far away as the planet Jupiter to look for life in outer space, because the dust becomes thinner the further we travel towards the outer edges of our own solar system.
望远镜要放置在木星那样遥远的行星上才有可能在外层空间搜寻生命。因为我们越是接近太阳系的边缘，尘埃就越稀薄。
The tourist attraction, which was well-known for its torrential waterfall, now only has a mild flow in the rainy season and becomes even thinner in winter.
即使雨水季节，瀑布也只有"一根线"，到了冬季则更加纤细。
The higher you climb a mountain, the thinner the air becomes.
你越往山上爬，空气就变得越稀薄。
The higher the ground is, the thinner air becomes.
离地面越高，空气就越稀薄。
There is also a relatively rare condition called keratoconus where the cornea becomes progressively thinner and cone shaped.
当然，在极少数情况下，角膜会逐渐地变地很薄，形成圆锥形角膜。
There is also a relatively rare condition called keratoconus where the cornea becomes progressively thinner and cone shaped.
当然，在极少数情况下，角膜会逐渐地变地很薄，形成圆锥形角膜。
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