在高速下，鲨鱼分辨不出其中的区别。

At high speeds the sharks can't tell the difference.

youdao

我真地看不出他们的政策和我们的政策有什么区别。

I can't really tell the difference between their policies and ours.

《柯林斯英汉双解大词典》

相互竞争的品牌之间往往看不出明显的区别。

There is often no discernible difference between rival brands.

《牛津词典》