表述机织物组织结构特征的重要参数。指相邻两根纱线上同性质最靠近的经(纬)组织点的纵向(或横向)的间隔纱线根数。沿经纱方向计算的称为经向飞数，又称纵向飞数;沿纬纱方向计算的，称为纬向飞数，又称横向飞数。经向飞数以向上数为正向下数为负;纬向飞数以向右数为正向左数为负。常用于缎纹组织。
想象下自己飞梭在美妙的宇宙中，也许你会兴奋一阵子，但是如果一次就让你持续数周时间会令你深感不安。
Feeling like you're floating through a cosmic wonderland might be exciting for a while, but doing that for weeks at a time can be very unsettling.
在三、四月份，有其它鹤到达时，就会有一些向前飞，使这里鹤的平均数保持在约300，000只。
Some depart onward as others arrive, keeping the average crane count during March and April at around 300,000.
研究褐飞虱通过水稻介导对稻瘟病菌侵入的作用中发现：5个水稻品种经过褐飞虱取食处理后的稻瘟病病斑数均比对照组显著降低。
The experiments of rice-mediated effects of BPH on rice blast fungus showed that there were less blast lesions in 5 rice varieties treated with BPH compared with their control groups.
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