| 1. | Consequently, radiometric dating has advanced briskly in the past 30 years .
因此，新近三十年来，放射性计时迅猛发展。 |
| 2. | Exact dates for sites can be calculated and the method is more accurate than radiometric dating techniques
用这种方法测量出的精确度要比放射性技术的高。 |
| 3. | Radiometric dating methods , measuring rods of “ deep time , ” indicate how old the earth really is
放射性元素定年法是深层时间的测量杆，可以告诉我们地球的年龄究竟有多大。 |
| 4. | Using radiometric dating methods , sugden determined that the ash settled into the fissure after a volcanic eruption 8 . 1 million years ago
萨格登使用了放射性测龄法，得出了火山灰是在810万年前沉积到裂缝中的结论。 |
| 5. | Using radiometric dating methods , sugden determined that the ash settled into the fissure after a volcanic eruption 8 . 1 million years ago
使用放射性断代法，苏格丹发现火山灰早在810万年前的一次火山喷发后，就已进入了裂缝。 |
| 6. | Using radiometric dating methods , sugden determined that the ash settled into the fissure after a volcanic eruption 8 . 1 million years ago
通过辐射测量的方式，瑟顿断定这些火山灰是在810万年前的一次火山爆发中沉淀在这个裂缝中的。 |
