远处的风车在微风中缓缓转动。

The ___windmill in the distance turns slowly in the breeze.

小男孩兴奋地挥舞着手臂，像风车一样转圈。

The little boy ___windmilled his arms excitedly as he ran in circles.

别为那些根本不存在的问题瞎忙活了，你只是在浪费精力。

Stop ___windmilling over problems that don't even exist—you're just wasting your energy.