The concepts of radiant emittance and of irradiance are complementary.辐射的发射强度和辐照度是两个互补的概念.Irradiance or its equivalent, the plane radiant temperature, can be simply measured.可以简单地量测辐照度或其当量 -- 平面辐射温度.Emittance and irradia...
我们爬山时,他掉队了.He fell behind when we were climbing the mountain.爬山时,汽车发动机可能发生故障.The car engine may stall as we go up the hill.老人爬山时蹒跚而行.The old man faltered as he climbed the hill....