这句话的原文是:Some indivials would therefore not have been caught, since no ted hooks would have been available to trap them, leading to an underestimate of fish stocks in the past.翻译过来是说:因为那时没有足够的鱼钩抓它们,因此有些鱼可能会逃过一劫,这样就低估了过去的鱼的储量。这是一个经典长句,since引导一个原因状语从句作为插入语,分析的时候不能把后面的一段省略掉啊。