dragline
/ˈdræglaɪn/noun
1
- a large excavator with a bucket pulled in by a wire cable拉铲挖掘机。
2
- a line of silk produced by a spider and acting as a safety line or (in newly hatched spiderlings) a parachute（蜘蛛为自身安全所织的）避敌丝; （蜘蛛为幼蛛所织的）降落伞逃生丝。