one of the animals that helps people lot is the dog.这个句子怎么理解,that怎么在这用,详解.

one of the animals that helps people lot is the dog.这个句子怎么理解,that怎么在这用,详解.

that在这里是定语从句的连接词,带后面的定语从句：helps people lot 实际这句话可以分成是：one of the animals helps people lot,it is the dog,直译就是：狗是帮助人们最多的动物之一.