但在通常情况下，由于程序中不可执行的语句或路径的存在，使得基于数据流的测试准则不可行。
But because of the infeasible statements and paths in some programs, most data flow testing criteria are not applicable.
说明语句不可出现于可执行的部分。
A specification statement cannot appear in the executable section.
说明语句不可出现于可执行的部分。
A specification statement cannot appear in the executable section.
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