These factors must be balanced by the selection of diamond grade and concentration that will provide the operator with optimum performance at a suitable cost.
这些因素必须同时顾及挑选钻石分级及浓度，将提供最佳的营表现在一个适当费用。
Fairness does not have to mean leniency. It simply means to grade your students on a balanced scale.
公平并不就意味着宽大仁慈，而是在平衡的范围内为学生打分。
In fact, it is difficult or even impossible to develop and utilize a considerable amount of the balanced ore reserves due to the Iower grade indexes.
由于指标偏低，使相当数量的平衡表内储量，实际上目前很难甚至尚无法开发利用。
In fact, it is difficult or even impossible to develop and utilize a considerable amount of the balanced ore reserves due to the Iower grade indexes.
由于指标偏低，使相当数量的平衡表内储量，实际上目前很难甚至尚无法开发利用。
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