1. But there was a flaw in Ross´s experiment.
    但是罗斯的实验有一个缺陷。

2. This immense chasm has been formed by an underground stream which has tunnelled a course through a flaw in the rocks.
    这个深邃的洞穴是由一条地下暗泉冲刷岩石中的缝隙并使之慢慢变大而形成的。

3. I can´t find a flaw in his argument.
    在他的论点中, 我找不到任何破绽。