So hidden from our eyes, plant roots are colonized by a fungus called arbuscule mycorrhizae.

隐藏在我们的眼皮底下，植物的根茎被一种叫做丛枝菌根的真菌定殖。

So to make the trade, the fungus penetrates into the root cell of the host and forms a tiny structure called an arbuscule, which is Latin for " little tree."

所以为了达成交易，真菌渗透到宿主的根细胞中形成一个叫做丛枝的微小结构，在拉丁语中是“小树”的意思。