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。
2
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。
3
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.