关于清单2、3和4中的条目，好的方面是，在所有应用程序中它们几乎都是一样的，实际上这就是样板代码。
The good news about the entries in Listings 2, 3, and 4 is that they are virtually the same in all of your applications and essentially boilerplate code.
实际上洋底几乎和露出的陆地一样是高低起伏的。
Actually the ocean floors are almost as irregular as the exposed land areas.
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