One assessment found that 50% of leafcutter bees and 27% of mason bees are considered at risk.

一项评估，50% 切叶蜂和 27% 石匠蜂被认为处于危险之。

And these stylish-looking leaf-cutter bees found in the western U.S., some of these bees are as small as a grain of rice.

这些在国西部时髦切叶蜂，其一些蜂只有一粒米那么小。

And this pungent tune helps keep Hoplocampa testudinea, the European apple sawfly, from being eaten.

这种刺鼻曲调有助于防止欧洲苹果叶蜂 Hoplocampa testudinea 被吃掉。