a length of中文什么意思

有一段引起反感的文字必须删掉

• length:    n. 1.长，长度，长短。 2.(时 ...
• at length:    长久地，详尽地; 冗长的，很长（时间 ...
• by length:    曲线延伸至特定长度

例句与用法

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1. He fished a length of string out of his pocket .
   他从口袋里掏出一条绳子。
2. At a length of 25mm the distribution is bimodal .
   长度为25mm时，分布是双峰形。
3. I need a length of wire or string to tie it with .
   我需要一根铁丝或绳子来捆它。
4. The sample loop was a length of stainless-steel tubing of the correct volume .
   注样回路上有一段不锈钢定量管。
5. A length of aluminum tubing, flattened at its tip in a vertical plane, serves as a pointer .
   端点沿直面压扁的一段细铝管，作为指针之用。