词汇	光源效率
释义	光源效率医efficiency of light source
随便看	What date is it? what date is it today What date is it today? What Davidson had done soon appeared what day what day is it today what day is it today? What day is the seventh day of the week What day is the seventh day of the week? What day is the tenth What day is the tenth? What day is today What day is today? What day is tomorrow what day is tomorrow? what day is your birthday what day is your birthday? what day it may be what day it may be? What days will more busies What days will more busies? What day was yesterday what decide car insurance fee What deduction can we make from these facts What deduction can we make from these facts?