该模型考虑矿体的开采顺序和矿床不同区段的品位分布，实现了地下开采边界品位在时间和空间上的动态结合。
The model considers the mining order and the grade distribution in different deposit sections and has realized the time-space dynamic combination of the cutoff grade in underground mining.
面临依赖进口的窘境，意大利已开始致力于开采在边界内发现的可再生能源。
Faced with such dependence on imports, Italy has been making an effort to exploit the renewable sources found within its borders.
他们预言，在海底开采金、银、铜将成为下一个最大的生态灾难，因为海底脆弱的海洋生态系统是我们知之甚少的边界。
The fragile marineecosystem of the sea floor is a frontier that we know very little about
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