swordbills can't reach their feathers with their beak. 刀嘴蜂鸟的喙够不到身上的羽毛

128. For a start, it's tricky to keep it clean.
     首先 想保持干净就有点难度
129. Harder still, how do you preen your body feathers?
     更麻烦的是 要如何整理羽毛呢
130. Unlike the other hummers,
     不像其它蜂鸟
131. swordbills can't reach their feathers with their beak.
     刀嘴蜂鸟的喙够不到身上的羽毛
132. The only option, a good old scratch.
     唯一的办法就是用爪子挠
133. It's a little unrefined...
     虽然不太优雅
134. ...but a small price to pay for an exclusive food supply...
     但这是独享食物要付出的一点小代价

来自《行星地球 第二季 第三集 Planet Earth S02E03 丛林》第 131 行