So picking those plants isn't really hard.

所以选择这些植物并不难。

You have to be very careful though when picking the plants.

不过，你在采摘植物时必须非常小心。

And I'll tell you why we're picking crop plants to do the work for us when I get to that part of my talk.

当我讲到那部分时，我会告诉你为什么我们要采摘农作物来为我们做这项工作。