Current modules have 10 percent efficiency and an installed system cost of about $4 per watt.
现在通用的组建效率约为10%系统安装费用需要4元每瓦。
2
And it does not require much energy to work: in its current form the exoskeleton has just two small clutches which only draw a quarter of a watt of power each.
其在能量上的需求也不大，目前的设计只有两个离合器需要各四分之一瓦的电力。
3
But his colleagues changed the rules so that the current chief justice, Joseph Watt, could extend his term by two years.