ground contact的用法和樣例：
例句
- High-heeled shoes will reduce the heel contact with the ground so long strained Achilles tendon.
穿高跟鞋會減少足跟部與地面接觸，使跟腱長時間處於緊張狀態。 - When humans walk or skip on uneven surfaces or steps, their ankles can rotate freely and make most of the soles to contact with the ground before the bodies losing balance.
人在不規則地面，台階等地面行走或跳躍時在失去身體平衡之前腳脖可以向各個方向旋轉使腳掌大部分與地面接觸。
