Manage the length of the path environment variable.

管理路径环境变量的长度。

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The length of the buffer is smaller than the length of the path string.

缓冲区长度小于路径字符串的长度。

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The primary path length difference between asynchronous and synchronous polls is the allocation and eventual clean up of control blocks.

异步和同步poll之间的主要路径长度差异是，分配和最终清除控制块。

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The length of the reference path is such that if no sample is present, the two daughter beams will be as perfectly in phase when they meet as they were when they were separated.

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Since the speed of light through a cable is consistent, the difference is entirely in the length of its path.

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