arrow-head的用法和樣例：
例句
用作名詞 (n.)
- The arrow indicates where we are.
箭頭表示我們現在所在之處。 - This arrow shows which direction is north.
這箭頭表示北方。 - The other was the result of the low toughness and deformability in cylindrical arrow cross-section.
另一種裂紋是當圓柱形箭鏃桿膨脹時，礦化層的塑性差，抗變形能力低而產生的開裂。 - The arrow of craft shot by her.
詭計的夭鏃在她身邊飛過。
