例句與用法

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1. He proved the existence of parallel lines .
   他證明了平行線的存在性。
2. Parallel lines indicates a break in continuity .
   平行線表示連續(xù)的中斷。
3. A family of parallel lines cut the conic .
   有一組平行線與圓錐曲線相交。
4. Consider a family of parallel lines that cut the conic .
   設(shè)有一組平行線與圓錐曲線相交。
5. Jerusha went without comment, but with two parallel lines on her brow .
   杰魯莎默默地去了，額上平添了兩道皺紋。