Previously, it had been impracticable to try to measure lightning even if a mega flash occurred.

以前，即使发生超级闪电，也无法进行测量。

On the morrow of that Monday, Earnshaw being still unable to follow his ordinary employments, and therefore remaining about the house, I speedily found it would be impracticable to retain my charge beside me, as heretofore.

那个星期一之后，恩萧仍然不能去作他的日常工作，因此就逗留在屋里，我很快地发觉要像以前那样担任照顾我身边的小姐之责，是行不通的了。