我观察到一群切叶蚁正把切好的叶子运回巢穴。

I watched a group of ___leafcutters carrying neatly cut leaves back to their nest.

我在花园里看到一只切叶蜂正从树叶上切下一小块圆形叶片。

I saw a ___leafcutter bee cutting a small circular piece from a leaf in the garden.