The traditional methods for treating As-containing wastewater, such as physical and chemical ones, have some shortcomings: high cost, serious second pollution, and hard to be applied.
前言：含砷废水的传统处理方法如物理法和化学法的不足之处是费用高、二次污染大、工程化程度小。
It's hard to learn a concept, but once you understand it, that knowledge can be applied repeatedly.
学习一个概念绝不容易，但一但你真正理解了它，知识便可以重复利用。
It can be hard to figure out the value to place on a person's skills if they've never applied them somewhere else.
如果这些人从来没有在其他地方应用过自己的技能，那么将很难发现这些技能的价值。
It can be hard to figure out the value to place on a person's skills if they've never applied them somewhere else.
如果这些人从未在其他地方运用自己的技能，就很难搞清楚这些技能的价值。
The method was applied especially in the quantitative analysis of relevant factors which are non-mechanism and hard to be described by the common mathematical models.
这种方法尤其适用于一般数学模型难以描述的非机理型相关因素的定量分析。
In the research of QGP, the research method of Jet Quenching associated with hard process has been worked thoroughly, which can be applied to study the proper-ties of QED medium.
QGP研究中的与硬过程相关的喷注淬火信号的研究方法已经被研究得较为透彻，我们可以将其运用到研究QED介质中来研究QED介质的性质。
Ant colony algorithm is a novel simulated evolutionary algorithm based on group cooperation and can be applied to solve hard discrete combinatorial optimization problem.
蚁群算法是基于群体合作的一类仿生算法，适合于解困难的离散组合优化问题。
However only indirect approaches can be applied to the determination of oxygen demanded by tiny living individuals because in this case it is hard to make direct measurement.
然而对于一些微小生物个体无法直接测量，只有通过间接的方法求得。
While the label "hard of hearing" can fairly be applied to both groups, issues of personal and social identity will be quite dissimilar.
当”重听”的标志平等地用于两个群体时，他们的个体与社会的特性则截然不同。
While the label "hard of hearing" can fairly be applied to both groups, issues of personal and social identity will be quite dissimilar.
当”重听”的标志平等地用于两个群体时，他们的个体与社会的特性则截然不同。
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