Of course, there are still challenges, such as reducing the weight of the balloons, dealing with wind, and designing the optimal system for transporting the energy down to the surface.

当然，还有很多挑战，例如，减轻气球的重量，处理风的问题，设计最理想的系统传输能量到地面。

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A keel also provides weight low under the water to lower the boat's center of gravity below the waterline, which is needed so that the boat bobs back upright if knocked over by wind or waves.

龙骨同时也增加了船只的底部重量，从而将船只重心降到吃水线之下，而这对于船只在被风浪打翻时能够得以及时回正是十分必要的。

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AIRPORT ANALYSIS, A comprehensive set of takeoff weight limitations for a given airport runway, generally presented as a function of airport temperature, wind, and aircraft flap setting.

机场分析， 一套针对给定的机场跑道的详细重量限制资料。 通常与机场温度、风、和飞机襟翼位置成函数关系。

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After putting on some weight, when they feel a warm updraft of wind beneath their wings sometime around early April, it is time to continue moving north.

BBC: Nebraska��s awe-inspiring crane migration

This intimate story, bringing together the northern light reflected off water, the cold wind, the fear of poverty, the weight of the past, and the lack of a future, has a soulful, epic grandeur.

NEWYORKER: Just Anybody

This reduction in size and weight would lower overall wind development costs, resulting in a lower overall delivered cost of electricity.

FORBES: Offshore Wind: Enormous Potential, Huge Challenges