You should see a single-screen interface in which each step of the process is carried out inside its own tab and a window-shade visual effect marks the transitions between steps.

应该能够看到单一屏幕的界面，其中结帐过程的每个步骤都在各自的选项卡内进行，而百叶窗式的视觉效果则标记了步骤间的转换。

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Note: This step may be difficult to carry out on a single system because of memory constraints.

注意：由于内存限制，这个步骤可能难以在单个系统上执行。

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Each step was optimized during Synthesis processes and single factor experiments were carried out to determine the most effective conditions such as solvent, time, material ratio and so on.

合成过程中对各步进行了工艺优化，通过设计单因素实验，找到了反应的最佳条件，如溶剂、时间、投料比等，使得产品收率有了较大的提高。

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We agreed to keep phasing out fossil fuel subsidies -- perhaps the single-most important step we can take in the near term to fight climate change and create clean-energy economies.

WHITEHOUSE: President Obama��s Press Conference on the G20 Summit