v.弯曲(关节),收缩(肌肉),显示力量
n.弯曲,[电]花线
I was required to hold out my arms and flex my pectorals.
我被要求伸展手臂,收紧胸肌。
Side cutters are useful for cutting electrical flex to length.
切边钳适用于剪切电线.
Take a comfortably wide stance and flex your knees a little.
双腿适度分开站立,双膝稍稍弯曲。