How to manage optimally and make use of the resource will play an important role in sustained-yield forest management in Heilongjiang province and determining the age of harvest cutting is the key.
如何合理地经营利用好这部分资源，对该省森林永续经营利用起到重要作用，其主伐年龄的确定是关键问题。
2
Without full and sustained business engagement, these projects often do not yield anticipated benefits.
如果没有全面和稳定的业务约定，这些项目往往不会产生预期的效益。
3
Dynamic efficient sustainedyield — the sustainedyield that produces the highest present value of net benefit.