Heels not only have to be the right height but in the right position: not too far back, but under the centre of the heel so they support your weight properly, following the natural line of your body.

鞋跟不仅要有一个合适的高度，也需要在正确的位置上：不能太靠后，要在脚后跟的中心，这样的鞋跟才能沿着你的身体曲线有效地支持你的体重。

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Finally, dangling the control pod well below the aerostat shifts the craft's centre of gravity downward. This means it does not need additional stabilisers, which add weight.

最后，悬挂在飞碟下面的液压中转控制盒使得飞行器的重心自然下移，因此不必安装其他的稳定器，从而减轻了重量。

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Upstanding toothbrush makes use of a weight at the end of its rounded handle to create a centre of gravity at the handle base.

可站立式牙刷利用自身圆胖的手柄底端的重量来让重心点落在手柄底部。

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Doctors at Charing Cross Hospital in London recommended gastric bypass surgery to Steven, as a result, and he went under the knife at the Imperial Weight Centre.

BBC: 'My type 2 diabetes was cured after gastric bypass op'

Author Alexander McCall Smith has thrown his weight behind a fundraising campaign to build a new visitor centre dedicated to the Battle of Prestonpans.

BBC: Writer calls for Battle of Prestonpans visitor hub