fiber axis的用法和樣例：
例句
- When this process occurs, molecular chains can orient in the fiber direction.
在此處理過程中，分子鍵能沿纖維軸向定向排列。 - It is proved that round-section fiber has Descartes rays, and its principle and characteristics are similar to the water drops producing the rainbow in the sun.
結果表明，透明圓形截面纖維在垂直纖維軸光線照射時有笛卡爾線產生，其原理與水珠在光照射時虹產生的原理相似。
