他在露营时用绳子打了个结固定帐篷。

He was ___tying the rope to secure the tent while camping.

小心别让鞋带打结了。

Be careful not to let your shoelaces start ___knotting.

长时间盯着电脑屏幕让她的颈部肌肉开始紧绷。

Staring at the computer screen for too long is ___knotting the muscles in her neck.