通过编辑文件，删除不需要的表并把它分割为几个输入文件，这样就可以采用分阶段转移方式，也就是并行地执行从源数据库卸载和装载到目标数据库。

Edit the file to remove unwanted tables and split it into several input files to do a staggered movement approach where you perform unload from source and load to target in parallel.

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这些金属都是沉重的，和一些地球化学家估计，它们应该在地球形成的早期阶段，已被转移到它的核心(在重力下)。

These metals are heavy, and some geochemists estimate that they should have been shifted to the core of the planet in the early stages of its formation (under the force of gravity).

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