如果进度条可见的话，那么这就意味着项目构建正在进行当中，而您必须等到它完成为止。
If the progress bar is visible, it means that the project build is in progress and you must wait for it to finish.
这意味着您只能在声明它的测试中引用该变量，而不是在其他测试之间引用它。
This means that you can reference this variable only in the test that it is declared but not across other tests.
这个统一的编程模型意味着当您要在一个分布式的方案中运行它时，您无需重写您的代码。
This unified programming model means you don’t need to rewrite your code when you want to run it in a distributed scenario.
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