1.the fungus that ants cultivate was a single type that they had propageted,essentially unchanged from the distant past
这里的that后面是什么从句 主句是什么 句子成份求具体分析
2.when desert ants return from a foraging trip, they navigate by integrating bearings and distances, which they continuously update in their deads.
这里的which后面是什么从句 主句是什么 句子成份求具体分析
第一句
they指的是什么?为什么? 能给我翻译一下这个句子吗