A hairpin is a thin piece of wire folded into a U, used to hold long hair in place — you slide it in so the two arms press the hair together. People with long hair use them to pin a bun, a twist, or a piece that keeps falling down. Some hairpins are plain metal; some have a little decoration on the bend.

A hairpinhairpin（髮夾） is a thin piece of wire folded into a U是一根折成U字形的細鐵絲 used to hold long hair in place用來固定長頭髮 you slide it in so the two arms press the hair together你把它滑進去，讓兩隻腳把頭髮夾住 People with long hair留長髮的人 use them to pin會用它來固定 a bun, a twist, or a piece that keeps falling down一個包頭、一個扭轉的髮型，或是一直掉下來的一小撮頭髮 Some hairpins are plain metal有些髮夾就是素面的金屬 some have a little decoration on the bend有些在彎折處會有一點小裝飾

Though actually, in everyday talk hairpin also names the shape: a hairpin turn (or hairpin bend) is a road curve so sharp it doubles back like that U. Drivers and cyclists use that a lot.

Though actually不過其實 in everyday talk hairpin also names the shape在日常用語裡，hairpin也用來指那個形狀 a hairpin turn (or hairpin bend)a hairpin turn（或hairpin bend） is a road curve so sharp it doubles back like that U是指一個急到會像那個U字一樣繞回來的道路彎道 Drivers and cyclists use that a lot開車和騎車的人很常用這個說法

The hair tool is ordinary, slightly old-fashioned next to clips and bands, but still common. The road sense is informal and vivid.

The hair tool is ordinary髮夾這個工具很普通 slightly old-fashioned next to clips and bands跟clip和band比起來有點過時 but still common但還是很常見 The road sense is informal and vivid道路彎道的這個用法比較口語，也很生動