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- The average age of the boys in this class is fifteen. 本班男生的平均年龄是十五岁。
- This layer of rock contains a lot of flint. 这一岩层中有大量燧石。
- I don't think he looks his age of seventy. 我感到他看起来不像70岁的人。
- The mountain rise up in a steep wall of rock. 这座山高而陡，形成一道岩石屏障。
- The mountain rose up in a steep wall of rock. 这座山高而陡，形成一道岩石屏障。
- The measurement of the decay of radioactive isotopes, especially uranium, strontium, rubidium, argon and carbon,has allowed geologists to more precisely determine the age of rock formations. 对放射性同位素衰变的测量，尤其是铀、锶、铷、氩和碳，可允许地质学家更精确地确定岩层的年龄。
- The age of majority is eighteen. 成年的法定年龄是18岁。
- He ran away from home at the age of thirteen. 他十三岁那年就离家出走了。
- To form bends in(a stratum of rock. 地层褶曲（在地层的岩石上）形成弯曲
- At the age of thirty, Mary began to lose colour. 玛丽在30岁的年纪就红颜渐逝了。
- A spur of rock stuck out from the mountain. 山背上突起一个石脊。
- She was orphaned at the age of ten. 她在十岁时成为孤儿。
- To form bends in(a stratum of rock). 地层褶曲（在地层的岩石上）形成弯曲
- My father retired at the age of 60. 我父亲六十岁时退休了。
- My grandmother got married at the age of seventeen. 我的祖母十七岁就结婚了。
- Fossils also provide information about the geography and the climate of prehistoric times, and indicate the age of rocks in which they are found. 化石也可向我们提供史前的古地理和古气候情况，并可指示埋藏它们的岩石的年龄。
- He was already balding at the age of 25. 他25岁就秃顶了。
- He managed to hang on to a piece of rock protruding from the cliff. 他设法抓住了悬崖上向外伸出的岩石。
- Dating techniques Methods used to determine the age of rocks, fossils, or archaeological remains. 测年技术：一种确定岩石、化石以及考古学遗迹年龄的方法。
- Cole popped off at the age of twenty. 科尔在二十岁时突然死去。
