这个询问关于追溯它的必要条件的请求的程序性方式可以十分直接地表达，如图10所示。
The programmatic way of asking a requirement about the requirements that trace to it can be expressed fairly straightforwardly, as Listing 10 shows.
机械通风设备使他们难于(即使并非不可能)表达他们的需要，或者是询问有关他们治疗情况或幸存几率的问题。
Ventilators make it difficult — if not impossible — for them to communicate their needs, or ask questions about their treatment or survival chances. Dr.
机械通风设备使他们难于(即使并非不可能)表达他们的需要，或者是询问有关他们治疗情况或幸存几率的问题。
Ventilators make it difficult — if not impossible — for them to communicate their needs, or ask questions about their treatment or survival chances.Dr.
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