The ropes quivered tautly under his hands.

他两手间绷紧的绳索微微抖动。

The central meaning Shared by these adjectives is. Not tautly bound, held, or fastened.

这些形容词所共有的中心意思是。并未紧紧地捆住、抓住或拴住的。

When the body falls a certain distance toward the ground, the elastic rope is pulled tautly to prevent the body from continuing to drop.

当人体落到离地面一定距离时，橡皮绳被拉开、绷紧、阻止人体继续下落。