Parallel straight lines are straight lines which, being in the same plane and being produced indefinitely in both directions, do not meet one another in either direction.
平行直线是在同一平面内的直线，向两个方向无限延长，在不论哪个方向它们都不相交。
A two-dimensional model of such a universe would look like a sphere. It's impossible to have parallel geodesics (straight lines on a curved surface) — the two lines will cross at some point.
这样的2维宇宙模型就像是球体，不可能出现平行的测地线(测地线是曲面上的直线)——两直线必然在某点相交。
In this illusion although the lines appear to be bent they are actually perfectly straight and actually parallel.
在这个错觉中，虽然线条看起来是弯曲的，但实际上却是笔直的，并且实际上是平行的。
Viewed in profile the top of the skull and the top of the muzzle lie in two parallel, straight lines of equal length, divided by a slight, but perceptible "stop" or break.
观察脑袋的轮廓和口吻的轮廓，是两条大致平行的直线，长度大致相等，被一个非常轻微，但可察觉的止部分隔开。
The pipes and lines shall run parallel with the planned red line of urban roads and highways and shall be laid straight.
管线敷设应当与城市道路、公路的规划红线平行，走向顺直。
There are several types of channels, and my favorite is a straight envelope - the lines above and below the EMA, both parallel to it.
有多种通道，我最喜欢的是直接包络线——两条线分别在EMA上下，都和EMA平行。
There are several types of channels, and my favorite is a straight envelope - the lines above and below the EMA, both parallel to it.
有多种通道，我最喜欢的是直接包络线——两条线分别在EMA上下，都和EMA平行。
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