When an insect brushes against them, this triggers a tiny electric charge, which travels down tunnels in the leaf and opens up pores in the tear's cell membranes.
当一只昆虫与它们擦身而过时,就会触发一种微小的电荷,电荷沿着树叶里的隧道向下移动,并打开泪液细胞膜上的小孔。
First, there is electric charge.
第一,电荷。
That is the electric charge in D.
这是D中的电荷。