明年，在一系列合并完成后，四家铁路公司将控制主要铁路运输公司90%以上的货运。

Next year, after a series of mergers is completed, just four railroads will control well over 90 percent of all the freight moved by major rail carriers.

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在您完成以上步骤以后，您可以将更多内容添加到项目中。

After you complete the steps above, you can add more content to the project.

youdao

完成以上步骤后，这个项目的类别应该如图6所示。

After you finish the above steps, the project category should look like Figure 6.

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I should use Cartesian or polar to pull out those pieces of it.

或者polar方法来读出这些值,一旦我完成了以上的操作。

麻省理工公开课 - 计算机科学及编程导论课程节选