flock bond strength

例句：

1. 1. The shepherd led his flock to the pasture.
   牧羊人带领他的羊群去放牧。
2. 2. She was a skilled herder of sheep.
   她是个熟练的羊群管理专家。
3. 3. The flock of birds flew away in the wind.
   一群鸟在风中飞走了。