flex例句

I was required to hold out my arms and flex my pectorals.
我被要求伸展手臂，收紧胸肌。

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。

Side cutters are useful for cutting electrical flex to length.
切边钳适用于剪切电线.

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