走路时腰部以上微微前倾 ，肘关节自然弯曲摆动，这有利于产生动力并平衡身体。

Walk forward. That means tilt slightly forward from the waist when walking. Bend your arms at the elbow and pump them as you walk. This helps to create momentum and balance.

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被称为离子的带电粒子沿着纳米线移动，导致它伸长、弯曲和摆动。

Charged particles called ions travel along the nanowire, causing it to stretch out in length and also bend and wiggle.

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球确实顺着平滑弯曲的道路，那么为什么击球者有时会看起来如此愚蠢地去摆动它们？

The ball really follows a smooth curved path, so why do batters sometimes look so foolish swinging at them?

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