The reason? They poach the paths of their rivals, who spin continuous silk draglines as they move.

原因为何？因为它们窃取了对手的路线，这些雄蛛会一边移动一边不停地吐出拖拉丝线。

She sailed into the air, let out a dragline, and dropped gently to the ground.

它吐出一根长丝，飞过去，轻轻落到地上。

She let herself down on a dragline until she hung in the air just in front of the big pig's snout.

它吐出一根长丝，一直落到那大猪的鼻子前面。

A spider's dragline silk, which is what it uses to stealthily drop onto your face while you're sleeping, is lightweight and stronger than steel.

蜘蛛的牵引丝，就是那根它用来在你睡觉时悄悄落到你脸上的线，这根线很轻，而且比钢铁还坚韧。

He had a battered face that looked as if it had been hit by everything but the bucket of a dragline.

他有一张饱经风霜的脸， 看起来好像除了吊斗铲以外的任何东西都被击中了。

They poach the paths of their rivals, who spin continuous silk draglines as they move.

他们开辟了竞争对手的道路，他们在移动时不断旋转丝质吊索。

For several days and several nights they crawled here and there, up and down, around and about, waving at Wilbur, trailing tiny draglines behind them, and exploring their home.

一连几天几夜，他们就这么这里那里，上下左右地爬着，对威伯挥着脚，从身后扯出细小的丝线，在他们的家里探险。