bristle
/ˈbrɪsəl/
a stiff fiber (coarse hair or filament); natural or synthetic
Chinese meaning: 硬毛；鬃毛
The toothbrush has soft bristles to avoid damaging the gums.
这把牙刷有软毛，以避免损伤牙龈。
The wild boar's bristles stood up when it sensed danger.
野猪感觉到危险时，它的鬃毛竖了起来。