Parallel lines have a lot in common, but never meet. You might think that's sad. But every other pair of lines meets once and then drifts apart forever. Pretty sad too.「有人說平行線最可怕,但我認為最可怕的是相交線-明明有過交集,卻總會在以後某個時刻相互遠離,而且越走越遠。」