查询结果:

vt. 弯曲,折曲,有弹性 
vi. 弯曲,折曲,有弹性
n. 弯曲,折曲 

来源于拉丁语动词flectere(弯曲)的过去分词flex·us。

-flex-弯曲→自由词根→flex弯曲 

词组:
to flex one's muscles 摩拳擦掌  

例:
machanical flex 机械性屈挠 
flex crack 挠裂 
He’s flexing his muscles, waiting for the day he becomes president. 他在摩拳擦掌，等着成为总统的那一天。 
Set windows in rubber so they flex during an earthquake. 将窗户用橡皮箍紧，地震时可有挠度。