ageing boundary造句

例句与造句

1. Abstract : based on the isotopic dating data of volcanics and recent research achievements of age boundary between jurassic and cretaceous systems , it is suggested that the volcanic series in shengyuan basin must be attributed to lower cretaceous
   文摘:本文根据盛源盆地火山岩同位素年龄数据和侏罗-白垩系界线年龄的最新研究成果，认为盛源盆地火山岩系的地层时代应属早白垩世。
2. It's difficult to find ageing boundary in a sentence. 用ageing boundary造句挺难的