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This main content of this thesis is divided into three chapters altogether: Chapter one summarizes the current situation of the environmental pollution, concentrate on danger of the aromatic hydrocarbon mainly, discuss the advantage of the biological method among several kinds of methods.

本论文主要内容共分为三章：第一章综述了环境污染的现状，主要集中在芳香烃的危害上，讨论了微生物治理环境污染在几种治理方法上的优势。

Pretreatment of arsenical refractory gold concentrate - Leaching by sodium dichromate ;2. The solution of sulfuric acid was added dropwise to the reaction vessel contained 1,3-dichloro-2-propanol, sodium dichromate and water.

将硫酸水溶液滴加到1，3-二氯-2-丙醇与重铬酸钠水溶液的混合物中，在温度23~27℃的条件下搅拌反应5 h，重铬酸钠∶1，3-二氯-2-丙醇=1∶2，此条件下收率为79。

After heated by microwave the specific surface of arsenopyrite, pyrite and gold concentrate have been improved to different extent.

经微波加热后，毒砂、黄铁矿、金精矿的比表面积都有不同程度的提高。

After 10 d and 15 d of bacterial oxidation of dearsenication, the final dearsenication rates of gold concentrate and arsenopyrite mineral were 93.90% and 64.45%,respectively.

经过10 d和15 d的细菌氧化脱砷，金精矿和毒砂的最终脱砷率分别达到93.90%和64.45%。

This paper mainly study on the algorithm of the evaluation and recognition of the highway asphaltum pavement crack, and mainly concentrate on the crack image processing and the recognition of the crack type.

本文主要是对公路路面裂缝的识别与检测算法进行原理性的研究，主要集中于裂缝图像的处理以及裂缝类型的识别两个方面。

I can concentrate, because it is to take the assessment.

我可专心了，因为这是要拿去评比的。

I'd decided camera angle so, I didn't need to concentrate on asymmetrical shape.

我要决定摄像机的角度，不需要把精力集中在非对称外形上。

Now we have to get back to being positive and concentrate on Sunday against Atalanta.

现在我们必须恢复状态集中注意力在周日对阵亚特兰大的比赛上。

I have a short attention span. I just can't concentrate.

我是个注意力很不集中的人，无论如何就是无法专注。

I don't think you enabled me to concentrate on any attributes of mine.

我认为你没有给我机会把注意力集中在我的资质方面。

A strange and mysterious deep sea creature.

一种奇异、神秘的深海生物。

It's a yellow rectangle .

这是黄色的长方形。