A poke, prod, or pinch between or on the buttocks.
戳、捅推或戳，如用手指或手臂；戳。
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。
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。
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