物质循环、再生利用的生态学原理是自然资源和环境从有限到无限的生命原则。
Circulating and regenerating mechanism make the natural resources from finite to infinite and it is the life rule for ecosystem.
它以生态系统中能量多级利用和物质循环再生为基本原理，按照这一原理，就可以合理设计食物链。
It takes advantages of the basic ecosystem principle of multi-level energy exploitation and substance recycling to reasonably design food chains.
介绍了新型离心萃取机的工作原理、特点及其在碱性蚀刻液再生循环中的应用状况及前景。
The working principle, characteristics and application status and trend of a new type of centrifugal extractor in alkaline etching solution recycling were introduced.
应用推荐