n. a very thin line
n. the natural margin formed by hair on the head
n. 发际线, 细缝, 细微的区别
[机] 细标线
1. The hairline on his forehead is starting to recede.
他的额头发际线开始后退了。
2. She styled her hair to cover her hairline.
她把头发打理成样式来遮住发际线。
3. A good haircut can make a hairline look more defined.
一款好的发型可以让发际线看起来更加明显。