他们在大部分区域内都可航行，只是偶尔需要进行陆上搬运，比如说把独木舟搬到附近的另一条小溪中。
They could travel throughout the area only occasionally having to portage, to carry the canoe over a land short distance to another nearby stream.
文件系统，从另一方面说，是驻留在分区之内的数据结构。
File systems, on the other hand, are data structures that reside inside partitions.
这就是说，您考虑调整分区的前提是，一个或多个分区必须是快满了，或者说您确定不久将会添加很多数据，可能会导致溢出。
That is, one or more partitions must be nearly full or you must expect to add enough data to overfill a partition in the near future before you consider resizing.
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