sinew|sinews

坚持不懈是成功的韧劲所在。

Perseverance is the ___sinew of success.

团结是国家力量的支柱。

Unity is the ___sinews of a nation's strength.

拉伸时，他感到膝盖后方的肌腱有些紧绷。

While stretching, he felt some tightness in the ___sinew behind his knee.