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One is a direct test and another is a boundary test.
其中之一可直接检验，另一个通过边界检验。
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The method has mild reaction condition and simple and direct test steps.
该方法反应条件温和，实验步骤简捷。
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The method has mild reaction condition and simple and direct test steps.
该方法反应条件温和，实验步骤简捷。
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