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。

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。

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。