radiocarbon发音名词1放射性碳、碳十四Scientists measure radiocarbon in bone to estimate its age.科学家测量骨头中的放射性碳,以推估其年代。形容词1放射性碳的、碳十四的仅用于名词前Radiocarbon dating showed the wooden beam was about three thousand years old.放射性碳定年显示这根木梁大约有三千年的历史。用这个字练口说→