a length of

• 一根, 一段

a length of的用法和样例：

例句

1. He fished a length of string out of his pocket.
   他从口袋里掏出一条绳子。
2. A length of film containing photographs, diagrams, or other graphic matter prepared for still projection.
   幻灯胶片，电影胶片为静止投影而准备的含有相片、图表或其它图表性东西的一段胶片
3. A length of yarn, cord, or thread, especially a strong silk thread used mainly to bind the edges of buttonholes.
   丝线一段毛线、粗线或丝线，尤指主要用来缝合钮扣孔的结实丝线
4. A length of netting attached to a woman's hat or headdress, worn for decoration or to protect the head and face.
   面罩附于妇女的帽子或头巾上的一段网状物，穿戴起来用作装饰或保护头部或脸部