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汉语拼音：zhí xiàn

数学中一个不定义的概念。是几何的基本元素之一。可以向两个方向无限延伸，经过两点有且只有一条直线，两条直线相交只有一个交点。直线上某一点一旁的部分称为射线，这个点称为射线的端点。直线上两点间的部分称为线段，这两点称为线段的端点。

1. 直的线条。对曲线而言。

   洪深 《戏剧导演的初步知识》下篇三：“曲线与直线比并在一起，直线见得是刚性的，曲线是柔性的。”

• When the packing bag is torn along the stretching direction of the heat-seal layer, the opening is in a straight-line shape.

  该包装袋在沿着热封层的拉伸方向撕裂时，撕口成直线状。

• As one seasoned investor puts it: "A supercyle does not go in a straight line. "

  正如一位投资老手所言：“超级周期不会走直线。”

• As you deepen the bend of the knees, maintain a straight line from the top of your head to your tailbone.

  当你加深双膝的弯曲幅度是，保持头顶到尾骨一条直线。

• And before I realised, Talen had opened the door and flew straight down as the remote smacked him on the head.

  还没等我意识到，塔伦开了门，飞到直线下降的远程拍了拍他的头。

• So far, Permanent magnet linear synchronous motor as a primary drive source is one of the best subjects in this field.

  从现有情况看，在这一系统中采用永磁直线同步电动机作为主要动力源是最好的方案之一。

• Perhaps you could make a circular maze in a similar way by first drawing a set of concentric circles with lines radiating through them.

  或许以相似的方式制作出圆形的迷宫，可以先画一些同心圆，在用一些直线穿过这些同心圆。

• It may be observed that this bifurcation phenomenon is somewhat abstract, since it will only arise if KJ is perfectly aligned with the load.

  可以发现，分支现象有点抽象，因为它只能发生在KJ与荷载成一条直线的情况下。

• We do not realize that it moves not in a straight line, but in a curve, and that its direction constantly changes.

  我们并不能认识到它不以直线运动，而是沿着一条曲线，不断地变换着运动之方向。

• Smoke was going up in a straight line, showing that there was no wind.

  烟直线上升，说明无风。