'When I first got on it I thought it would never work and at a slow speed it's almost impossible to keep upright.

当我第一次驾驶时，我认为它肯定是没办法上路的，而且速度会非常的慢，并且要走直线也是很难的。

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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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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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As the wind picks up, the grand old lady drives her rail deep into the water, making it perilous for crew to manage the running backstays that keep the mast upright.

FORBES: Old Gaffers

Though the software component still needs to be built, the feedback from the forceplate could sense if a patient is about to lose his or her balance and compensate to keep the subject upright.

ENGADGET: vi-RABT improves ankle rehabilitation with virtual reality and robotics