A series of filters then ensures that convex polygons with peninsulas maintain a minimum isthmus width.

然后进行一系列过滤，保证凸状多边形能保持最小的狭缝宽度。

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A plane must maintain a minimum speed to generate lift, and the higher it travels, the faster it must go.

所以，飞机必须保持一个最低速度以产生升力，而且飞行的高度越高，飞机维系升力的速度也越高。

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And the method of calculating the proposed two new concept vehicles are put forward: Mitigation Brake should maintain a minimum speed and release time.

提出了两个新概念及计算方法：缓解列车制动时车辆全部缓解后应保持的最低速度及缓解时间。

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That means, for example, a military base would have to maintain a minimum force of security personnel.

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Options and futures often carry higher commissions than equity trades and investors in futures will be required to maintain a minimum margin.

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Banks must maintain a minimum amount of capital (equity, mainly) in relation to their loans: the riskier the loans, the more capital they must have.

ECONOMIST: Economics focus