那个陶工精心地制作了这个花瓶.The potter carefully shaped the vase.他们寻找曾经仿制过古代器皿的陶工.They sought out potters who had once made copies of the ancient vessels.那个陶工把他的标记压印在陶罐底下.The potter stamped his sign on the bottom of the pot....
天文学家能够测定每颗恒星的亮度。An astronomer can determine the brightness of each star.星星的光亮度各不相同.Stars vary in brightness.用18瓦的荧光灯灯泡有同样的亮度，而用电量却减少75％。With an 18-watt fluorescent bulb you get as much light but use 75% less electricity....