While the code presented here is fairly straightforward, it's a big change from the traditional approach.
虽然这里提供的代码相当简单,但却是对传统方式的巨大修改。
In the textbooks of yore, the Earth's inner regions like the mantle and core were presented as simple, fairly homogeneous regions.
在以往的教科书中,地球的内部如地幔和地核被描述成简单而几乎相似的区域。
The API presented here is at a fairly low level of abstraction.
这里给出的 API 具有相当低级的抽象。
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