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汉语拼音：píng xíng xiàn

在同一平面内两条不相交的直线。两条直线被第三条直线所截，如果同位角相等(或内错角相等，或同旁内角互补)，那么这两条直线平行。如果两条平行线被第三条直线所截，那么同位角相等，内错角相等，同旁内角互补。

1. 在同一平面内任意延长而始终不相交的两条直线。

• Between the two lines, there might be an occasional line to join the pair of parallel lines once in a while to touch base, isn't that ideal?

  两条平行线之间偶尔也会有一两条垂线或抛物线来联系联系，不好吗？

• A crossed cheque is a cheque across which two parallel lines have been drawn with the words "not negotiable" written between them.

  画线支票是票面上画有两条平行线并写着“不可流通”的字样。

• Two parallel lines, side with the intersection, turning into a butterfly, Yuchi lightly out of love poems.

  两条平行线，偏有了交点，化蝶，羽翅翩跹出爱情的诗篇。

• Crossed Check A check that has two lines across it to denote that it must be paid into a bank account.

  划线支票支票上加了两条平行线，表示必须存入某个银行账户。

• But mathematicians formalize this in a particular way. And what they do is, they do it through the concept of parallel lines.

  但数学家用一种特殊方式将这个形式化，他们所做的就是藉由平行线的概念。

• His forehead, naturally high and crossed by deep parallel lines, now ran all the way up to his pointed crown.

  他的额头，自然高，深部平行线交叉，现在运行的所有冠军，他指出，一路。

• Does not end. parallel lines do not end there, never intersect. in parallel with the two people will not.

  没有终点。平行线的那边没有尽头，永不相交。平行的两个人不会在一起。

• Zollner's illusion makes parallel lines seem to diverge by placing them on a zigzag-striped background.

  将平行线置于锯齿形条纹背景上，左氏错觉会让平行线看起来不平行。

• Dr. Aaron also rejects any parallels drawn between the "sin tax" placed on alcohol and cigarettes and a "fat tax" levied to fight obesity.

  艾隆博士也反对任何在对烟酒征收罪恶税和征收对付肥胖的“肥胖税”之间划平行线的做法。