0 a device that changes energy from the sun into electricity -- 太阳能电池板
Solar panels are used to power satellites. 太阳能电池板用来给卫星供电。
We can complete it step by step however long the road is and it can't be completed however short the road is if you don't even mark your footprint.
再长的路,一步步也能走完,再短的路,不迈开双脚也无法到达。