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。

Saying which he went out in disdain; and the landlord, having no one to reply upon, found it impracticable to pursue the subject.

说完他不屑地走了出去；房东没有人可以回答，觉得追究这个话题不切实际。

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。

In the case of crude oil carriers of 20-40,000 dwt there is provision for exemption by flag States where it is considered unreasonable or impracticable to fit an inert gas system and high-capacity fixed washing machines are not used.

对于 20-40,000 载重吨的原油运输船，如果船旗国认为安装惰性气体系统不合理或不切实际且不使用大容量固定式洗衣机，则有豁免规定。