第47课Through the Earth’s Crust
1、 Satellites orbiting round theearth have provided scientists with a vast amount ofinformation about conditions in outer space.
环绕地球运行的卫星，为科学家提供了浩如烟海的外层空间的资料，相比之下，对地球内部的结构则知之甚微。
2、 Until recently, scientists havebeen unable to devise a drill which would be capable of cutting through hard rock at greatdepths.
直至今日，科学家尚未能设计出一种能钻透极深处坚硬岩石之钻探机。
3、 Keeping the platform inposition at sea will give rise to furtherproblems.
固定此平台于海上不动将会遇到新问题。
4、 Scientists have been amazed tofind that it can cut through the hardest rock withgreat ease.
科学家发现的方法听起来意想不到的简单。