有时那个标准，即使并非不可能，也是很难达到的。
Sometimes that standard is quite difficult, if not impossible, to achieve.
准确地设想，即使并非不可能，也是很困难的——这就是范型变化的自然特性，它们无法被预测。
It is hard, if not impossible, to imagine exactly what it would be - such is the nature of paradigm shifts, they cannot be predicted.
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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