A fastening made by tying rope, cord, or thread.

• A particular way of tying that creates a looped fastening.

用绳子、细绳或线打成的固定结。

• 通过特定打法形成的环状系结。

A tangle or hard clump in hair, thread, or fibers.

头发、线或纤维中的缠结或硬块。

A hard lump in wood where a branch grew; a wood knot.

• A small swelling or tight spot in tissue or muscle.

木材中枝干留下的节疤。

• 组织或肌肉中的小肿块或硬结。

A unit of speed equal to one nautical mile per hour.

速度单位，每小时一海里。

A difficult problem, complication, or crux of a matter.

棘手的问题、纠结，或事情的症结。

To tie or fasten with a knot or knots.

• To wrinkle or contract, as the brow.

用结把…系住或固定。

• 皱起或收紧，如眉头。

A closed non-self-intersecting curve studied in topology.

拓扑学中研究的封闭且不自交的曲线。