But I 'm reading no discernable increase in radiation .
可是辐射读数并没有明显升高。
With smaller urban areas spread across the land surface and coastlines , the outlines of continental land masses are easily discernable at night .
再根据遍布陆上和海岸线上的众多小城市的灯火，大地的轮廓也能在夜晚容易地辨别出来。
Secondly , even though other objects are visible at this distance , according to shuttle astronaut jay apt , the great wall is barely discernable , if not invisible .
