混凝土的耐久性已成为重大课题。
那时大学里科学辩论的重大课题是生命的“自发生说”。
The great scientific debate in universities at that time was "spontaneous generation" of life.
对我们而言，这是一个十分紧迫而现实的重大课题。
这一题目长期以来一直是学术界极为关注的重大课题。
This question has been the important issue which since long academic circle pays attention extremely.
经济有效地控制氨氮废水污染是当前面临的重大课题。
Economical and effective control of pollution by ammonia-nitrogen waste water is a vital problem currently.
生态旅游研究是一个既有理论意义又有实践意义的重大课题。
Ecotourism study is a subject which has significance both in theory and in practice.
大学生道德教育是当代社会发铺入程中日渐凸显的重大课题。
Moral education is an increasing important issue in the course of development in contemporary society.
设计和开发优质的教学网站是当今远程教育中的一个重大课题。
Design and developing of an excellent instructional website is an important issue in distance education.
如何留住顾客是摆在中国电信企业面前的一个急需研究的重大课题。
It is an important problem for China Telecommunication Corporation how to maintain customer.
这些问题都摆在我们这一代面前，更是你们这一代面前的重大课题。
These are questions placed before my generation, and your generation as well.
在新的历史时期，网络道德教育逐渐凸显为一个不容忽视的重大课题。
In the new historical period, the network moral education highlights is can not be neglected.
如何选择正确的耕作方式抗旱保丰收已经成为多年来一直探索的重大课题。
The correct choice of tillage way to resist drought is an important task for study.
矿坑涌水直接危及地下矿山矿井安全，保障矿山安全渡汛是地下矿山的重大课题。
The gush-out water in the mineral pit endangers the underground mine safety directly.
提高顶煤放出率是综放开采的一个重大课题，预注水弱化顶煤是解决这一问题的有效方法之一。
Weakening top coal by using water pre-infusion is one effective method to solve this problem.
提高顶煤放出率是综放开采的一个重大课题，预注水弱化顶煤是解决这一问题的有效方法之一。
Weakening top coal by using water pre-infusion is one effective method to solve this problem.
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