请记住，从“用户视图”或“编程模型”的角度来看，并发就是关于调度对不可分资源的访问这样一件事情。

Keep in mind the "user view" or "programming model" of concurrency as a matter of scheduling access to a unitary resource.

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模型的可分析性是有限的。

Analyzability of the model is limited.

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和听起来一样不可思议，Bigelow Aerospace制造并发射了可分离的空间站模型(见图片)并且希望，某一天，建立起一个商用空间站。

Improbable as it sounds, Bigelow Aerospace makes and launches inflatable space-station modules (pictured) and hopes, one day, to build a commercial space-station.

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