1. 多向色性當(dāng)沿不同的軸線觀察時，某些晶體顯示出不同的色彩，尤指三種不同色彩的性質(zhì)
   The property possessed by some crystals of exhibiting different colors, especially three different colors, when viewed along different axes.
2. 移動從中間位置或軸線向外或向后的振蕩或依次的運動
   A movement from and back to a mean position or axis in an oscillating or alternating motion.
3. 圓的軸線是其直徑。
   The axis of a circle is its diameter.
4. 在計算機制圖技術(shù)中，顯示圖象的全部或一部分對顯示面所在平面中某個軸線翻轉(zhuǎn)180度的處理方法。
   In computer graphics, turning all or part of a display image180 degrees about an axis in the plane of the display surface.

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線的英語翻譯：