Find out your plant’s foot-candle requirement, which is how many candles it would take to light the plant from one foot away.

找出植物所需要的“英尺烛光”，即在一英尺的距离需要点多少蜡烛来提供它光。

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Given realistic propulsion options, and the requirement that the spacecraft can slow down to orbit its target, the target star cannot be more than 15 light-years from Earth.

根据实际的推进选择，以及航天器能够减速以环绕其目标公转的需要，目标恒星不能离地球超过15光年。

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Experiment results showed that the newly developed material is soft, high insulation, and light weight, which can meet the requirement of protection device on main body packaging material.

实验结果表明，该材料的质软、高阻隔、质轻等良好性能，能满足防护装置对其主包体材料的需求。

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These include a requirement for pilots of even light aircraft and helicopters to file flight plans, giving precise timings.

BBC: Redhill airfield

Even with the new and welcome emphasis it will give the "Brilliant Pebbles" concept, the revised program is simply inadequate in light of the technological opportunities and the national requirement for a deployed SDI.

CENTERFORSECURITYPOLICY: Center For Security Policy

This requirement is one America uniquely faces in light of its need to provide extended deterrence a need that has not disappeared with the end of the Cold War and that, if anything, may increase with the proliferation of weapons of mass destruction.

CENTERFORSECURITYPOLICY: A credible nuclear deterrent