FPTA只记录时钟值的整数部分，而用时钟序的概念来模拟表示时钟值小数部分的大小关系，从而减少生成的状态空间。
To reduce the state space, FPTA records the integer values of clocks together with the order of decimal fraction instead of the real number values.
实验采用石英玻璃管模拟受限空间，通过改变玻璃管的直径调整受限空间的大小。
The quartz glass tubes are used for simulating the restricted space in the experiment, and the dimensions of the restricted space is adjusted by changing the quartz glass tubes size.
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