step screen

Using subsection screening ( SSS) method to screen the cDNA library by PCR step by step.

利用分部分排除技术（SSS法），结合PCR法逐级筛选cDNA文库。

That screen will be used by local audiences, seated on the terraced concrete bleachers that step down to the below grade portion of the project where a stage for speakers and performers is provided.

这个屏幕将被当地群众使用，他们可以坐在梯级式混凝土露天看台上，看台层层下降来到一个地下的部分，这里提供了一个可供讲演者和表演者们使用的舞台。

Blur your eyes or step back from the screen to check values.

眯起眼或者从屏幕前后退几步来检视下明暗关系.

The Scheduled Task wizard walks you step-by-step through adding tasks. Just follow the instructions on each screen.

任务计划向导将帮助您逐步完成添加任务。只需按照每个屏幕上的指令进行操作。

The recombinant gene yeast assay in combination with solid phase extraction of sample and three-step purified fractionation technique for pretreatment can rapidly and effectively screen out and quantitatively analyze the unknown estrogen-like matters in sample, and make evaluation on water treatment effect.

重组基因酵母检测技术结合水样的固相萃取、三步纯化分级前处理方法可以快速、有效地筛选和定量分析水样中未知类雌激素物质，并对水处理效果进行评价。