在现有的经济技术条件下，黑斑矿应确定为次边际经济资源，暂无开采利用价值。
The black-spot ore is sub-marginal economical resources and inadvisable to utilize at the present technical and economic conditions.
茶树鲜叶中的生化成分决定了茶叶品质的优次以及茶叶的适制性，从而决定了茶树品种资源的利用价值和茶叶的经济效益。
The biochemical components in tea fresh leaf decide the quality of tea and the tea type for tea fresh leaf, and also determine the value in use of tea germplasm resources and economic benefit.
森林火灾是一种世界性的林业重大灾害，我国每年都有上千次的森林火灾发生，造成严重的森林资源破坏、经济和财产损失。
Forest fire is one of the most major disasters in the world. There have taken place thousands of forest fires every year in China, which have destroyed enormous forest resources and economy damage.
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