未绷紧的绳子；松弛的肌肉

A slack rope; slack muscles.

他们有一个绷紧的肌肉和更深入的味道比汤普森。

They have a taut flesh and more depth in flavor than the Thompson.

他绷紧的肌肉泄露了这一点，他的脑袋里满是可怕的想象。

He was rather tense and his tense muscles exposed this.