bell·weth·er /ˈbɛlˈwɛðɚ/
系鈴羊,前導,領導者
Bell·weth·er n.
1. A wether, or sheep, which leads the flock, with a bell on his neck.
2. Hence: A leader. [Contemptuous]
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bellwether
n 1: someone who assumes leadership of a movement or activity
2: sheep that leads the herd often wearing a bell