How they are pinching it with their " nippers" !

它们用螯死命地抓住鱼，打得可凶了！

The only way to know for sure, and even then there are exceptions, is the size of its pincers.

唯一有效判法就是它螯小，不过这也有例外。

But species with tiny little pincers can't count on these alone to subdue their prey, so they have a very powerful and often very dangerous venom.

但是螯纤细种类就不能仅靠螯来制服猎物，所以它们毒液毒性很强，有时候相当危险。

A scorpion with thick strong pincers can master its prey without having to waste energy stinging it, so the venom of these species is usually not very toxic.

螯粗壮蝎子能直接控制猎物，不用费力蛰它，所以这些种类蝎子毒性一般不是很。