On our spherical Earth, gravity pulls "down" us toward the planet's center of mass. So on a flat surface, we naturally stand up straight.
在我们地球上，重力会把我们拉向星球的质量中心，因此在平坦的地表，我们自然站得很直。
If shoes are uncomfortable when you stand, they're likely to feel even worse when you walk. The wrong shoes can affect the body's centre of gravity.
如果穿鞋站着都不舒服，那么走起路来会更难受。不舒适的鞋子会影响身体的重心。
If shoes are uncomfortable when you stand, they're likely to feel even worse when you walk. The wrong shoes can affect the body's centre of gravity.
如果穿鞋站着都不舒服，那么走起路来会更难受。不舒适的鞋子会影响身体的重心。
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