It is informative to contrast this with the observed values of various trace gases in the atmosphere . 这一值与观测到的大气中各种微量气体值作一比较是有益的。
He did note, however, that a band appeared in addition of a trace of water to such an ethereal solution . 但是他确实注意到当往乙醚溶液中加入微量水时，就出现了一条滞带。
Appreciable differences may occur, however, when small deformations considerably alter the loading conditions . 当微量变形能使加载条件发生颇大改变时，就会产生颇大的差异。
Hydrolysis of polymers, as with their low-molecular weight analogs, is often catalyzed by traces of acids or bases . 和它们的低分子量的类似物一样，微量的酸或碱常能促进聚合物的水解。
the authors suggest that the traces of nitric acid may be removed by boiling cyclonite in an autoclave at 140℃. 研究者们提出，（黑索金中）微量的硝酸，可于140下在压热器中煮洗除去。
Many of the determinations used fall into the realm of microanalysis because of the small amounts of contaminants present in the samples . 因为存在于样品中的沾染物含量很少，所以许多测定方法属于微量分析范畴。
Even foods that are eaten freshly, we now know, can contain chemicals in trace amounts that could, in large amounts, be dangerous . 我们现在知道，连我们吃的新鲜食品也含有微量的化学药剂，含量一大，就可能有危险。
How to promote the precision of gas - micro - analyzer 提高微量气体分析仪的测量精度
Determination of trace chloride in cement concrete 水泥混凝土中微量氯化物的测定
We detected traces of the poison in her food 我们在她的食物里发现了微量毒药。
