N-COUNT Your buttocks are the two rounded fleshy parts of your body that you sit on. 臀部
There were marks on his buttocks I hadn't seen before.
他的臀部有些我从没有见过的疤。
At the front of the pelvis is the psoas and at the back, the glutei or buttock muscles.
位于骨盆前侧的是腰肌，在后侧的是臀肌。
Objective to explore the countermeasures for newborn red buttock early warning and nursing.
目的：探讨新生儿红臀的预警以及护理对策。
Then exhale and twist your torso to the right, keeping the left buttock on or very close to the floor.
呼气扭转你的躯干向右，保持左臀在地板上或者很离面很近。
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