The gluteus maximus in the buttocks works with the psoas (located high at the front of the thigh) to balance the pelvis from front to back.
臀大肌与腰大肌(位于大腿前侧上方)共同工作，保持骨盆前后两侧的平衡。
The single biggest muscle in the human body is the gluteus maximus, or the buttocks.
人体中单块最大的肌肉是股大肌，也叫臀大肌。
About 2 million years ago, the ancestors of modern humans evolved the physiological "equipment" for running--long legs, large buttocks, and springy structures in the feet, among other features.
200万年以前， 人类的祖先为经常跑路的脚制造出一种生理“设备”--鞋子。 这种设备有很多特点，后跟很大，鞋底有弹性。
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