Walking keeps you upright and enlists gravity to keep acids from splashing up the esophagus.

散步可以帮助你直立和获得地心重力的作用，去防止胃酸上溅到食道上。

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If the centerboard is not weighted, like the fiberglass centerboards of many small sailboats, then sailors must keep the boat upright by positioning their own weight on the upwind side of the boat.

如果活动龙骨不带负重，例如许多小型帆船使用的玻璃纤维活动龙骨，那么水手们必须通过将他们自己的体重压在船只的逆风侧来保持船只直立。

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The park said Tuesday that all its 19 dolphins have been on a low fat diet since late August, when they started failing to hit jumping targets and keep upright while treading water.(See photo)

该公园9月30日说，园内19只海豚在表演时总是无法跳跃到规定高度，游弋时躯体也经常与水面垂直，于是从8月底开始只给它们食用低脂肪食物。

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