这在根据取样结果下结论前是很必要的。
This is necessary before any conclusions can be made based on the sample results.
不好的取样技术会有相反的测试结果(见下)。
A negative test may also be the result of poor sampling technique (see below).
不好的取样技术会有相反的测试结果(见下)。
A negative test may also be the result of poor sampling technique (see below).
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