It has now reached a point where a growing number of people believe that it is far too high, and that bringing it down will be one of the great challenges of the twentyfirstcentury.
现在,到了越来越多人认为它太高了的程度,而且使它降低将是21世纪最大的挑战之一。
2
The task facing medicine in the twenty-firstcentury will be to redefine its limits even as it extends its capacities.
21世纪医学面临的任务将是重新定义其限制,即使它扩大了其能力。
3
Geothermal energy probably will not make large-scale contributions to the world energy budget until well into the twenty-firstcentury, if ever.