天文学家能够测定每颗恒星的亮度。An astronomer can determine the brightness of each star.这颗恒星的表面温度估计在零下75摄氏度左右。The star's surface temperature is reckoned to be minus 75 degrees Celsius.这些恒星一定是形成于100到150亿年前。The stars must have formed...
“我们是警察,”直升机上传来扩音器中的声音。"This is the police," came the amplified voice from the helicopter.我清楚地听到扩音器里在请都灵至阿姆斯特丹航班的旅客登机。I distinctly heard the loudspeaker calling passengers for the Turin-Amsterdam flight.他们把吉他与扩音器相接。They p...