- 1髮際線；（細如髮絲的）細微裂縫
Your hairline is the edge where the hair on your head stops and your forehead begins. A 'receding hairline' means the hair is slowly moving back. Separately, hairline describes something extremely thin: a hairline crack is a crack as fine as a hair.
core核心畫面
組成hair + line.
原始詞典資料4 筆記錄
以下是外部詞典記錄的用法，摘錄並精簡格式，我們還沒有寫成教學內容。上面的說明才是我們自己寫的；有些用法可能上面已經講過了。
hairlinenoun/ˈhɛɹˌlaɪn/
- 1
The line along one's forehead where hair starts growing.
- It's just a receding hairline — it's not like you're going bald.
- Using a Danish technique, doctors can now insert plugs of just one or two hairs in front of an implanted area to simulate a natural hairline.
- 2
A very thin line in writing, drawing, or typography.
- 3
A very thin fissure.
- While inspecting the new house, we found a few hairlines in one of the walls.
- There was a hairline crack in the airplane's wing.
- 4
A fishing line made from hair.
摘錄自 英文維基詞典 English Wiktionary，已精簡格式；依 CC BY-SA 4.0 授權使用，改動後的內容同樣以此授權提供。