如果控制溶液和对照溶液没有同时比较进行，试验无效。

The test is invalid if the monitor solution is not comparable with the reference solution.

youdao

他试验过了各种疗法，但是仍无效果。

He has tried all sorts of cures, but he is still ill.

youdao

支承容器的方式不得使试验结果无效。

The manner In which the packagIngs are supported shall not Invalidate the test.

youdao

谢尔比说：“刺激手段基本上无效，我们做过这种试验了。

Stimulus basically does not work. We have tried that, " said Shelby."

youdao

谢尔比说：“刺激手段基本上无效，我们做过这种试验了。

Stimulus basically does not work. We have tried that, " said Shelby."

youdao