当访问对象时，它引入了一个间接的层。

It introduces a level of indirection when accessing an object.

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跟踪然后遍历引用链直至标记完根集中所有(直接或间接)可获得的对象。

It then traverses the chain of references until all (directly or indirectly) reachable objects from the root set are marked.

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也许在将来，他们会直接或者间接地慎重选择他们的借贷对象。

And in future they may be choosier about who they lend to, directly or indirectly.

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