...有趣以至于他的课堂很有趣 » He is very interesting that his class was interesting 保持好的姿势 » To maintain good posture 我家房子前面有一棵大树 » My House in front of a big tree ..
Since keeping the ball stable requires abdominal strength and concentration, distracted workers may not maintaingoodposture or end up rolling onto the floor.
The wedges increased the forward tilt of the pelvis, which reduced pressure on the lower lumbar discs and the muscular effort required to maintaingoodposture, researchers said.