一些科学家质疑这样的假设，即在自然生态系统中，外来物种的出现是绝对不会被接受的。

A number of scientists question the assumption that the presence of alien species can never be acceptable in a natural ecosystem.

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反馈：对系统当前状态的具体反馈绝对是无价的。

Feedback: Concrete feedback about the current state of the system is absolutely priceless.

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重视减少这类死亡人数的需要，也就是重视加强卫生系统之绝对需要。

A focus on the need to reduce these deaths means a focus on the absolute need to strengthen health systems.

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