A second concave part is formed on the bottom surface of the base plate.
该基板的该底表面形成一第二凹陷部。
Different species of these lived at the surface and the bottom of the ocean.
这种生物的不同种类生活在海洋的表面或底部。
Average distance between the top and bottom of valleys on a surface.
表面的波峰底到波峰顶的平均距离。
Non-slip surface: The bottom of bathtub should have non-slip surface to guarantee your safety.
防滑表面：浴缸底面须有防滑表面，确保您的安全。
Draw more shadows on top bottom of the flash surface.
画出闪光表面顶底更多的阴影。
When the surface of a lake is still, one can see to the bottom very clearly.
当表面还湖，人们可以很清楚地看到底部。
When the surface of a lake is still, one can see to the bottom very clearly.
当表面还湖，人们可以很清楚地看到底部。
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