if it were not for the protection we get from insect-eating animals

问题描述:

if it were not for the protection we get from insect-eating animals
这句话是什么事我又两点不理解 一个 it 到底代表什么是什么语法2 for在这里是什么意思

是虚拟语气,以if引导的虚拟语气句,用过去式were,后面的句子用现在时态,翻译为:
如果不是为了保护的话,我们从食虫动物提取.
it表示we get from insect-eating animals