Based on his experience with the Science Barge, he has devised a rule of thumb: generating enough electricity using solar panels requires an area about 20 times larger than the area being illuminated.
基于他在科学驳船上的经验，他制订了一个经验法则：使用太阳能电池板产生足够的电能需要一块约20倍以于照明面积的电池板。
The same rule applies to solar heaters and wind turbines.
这些规则同样适用于太阳能加热以及风力发电。
As a rule, they are in industries designated as "strategic" -notably anything to do with energy, be it wind, solar or stored-and can also be found in medical equipment, drugs and technology.
作为一项规则，这些企业所在行业都被认定为“战略行业”。战略行业几乎涵盖任何能源相关领域，不管是风能、太阳能还是储备能源；医疗设备、药物和科技领域也在此列。
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