two-step

Fluoroaniline is synthesized in two steps from p-nitrochlorobenzene and active potassium fluoride.

以对氯硝基苯和活性氟为原料,经二步法合成了对氟苯。

Take two steps forward.

向前走两步。

In this paper,W amino polyoxyalkylene were synthesized by two steps.In the first step,polyoxyalkylene were brominated.In the second,the brominated polyoxyalkylene were aminated.

本文用聚乙二醇先，氨的二步合成法，合成了基单取聚乙二醇衍生物。

Trying to get the law changed has been a frustrating business. It’s a case of one step forward, two steps back.

修改这条法律的努力很令人沮丧，完全就是在进一步，退两步。

By this way, all high abundant serum proteins and most low abundant proteins disrelated to EMT-induction capability were removed in two steps.

经PAGE电泳将血清蛋白分为五组分，并对每组蛋白质进行EMT试验检测，发现具有明显EMT诱导能力的蛋白质主要在第四组分。