I think we should take care of the environment, so that we have something to leave for our children.
我觉得我们应该保护好自然,以便将来能给我们的子孙后代留下一些东西。
Sometimes the secrecy goes to such an extent that the whole nature of the research cannot be mentioned.
有时,保密竟达到了这样的程度,即连研究工作的整个性质都不准提及。