It's useful to have both positive and negative tests here, so you do both.
正数测试和负数测试对它都有意义，所以我们编写两个测试。
Once heartworm tests are negative, the treatment is considered a success.
当心蠕虫测试为阴性，则认为治疗是成功的。
The tests for hepatitis were negative .
父亲否定了我们的计划。
The tests for hepatitis were negative .
父亲否定了我们的计划。
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