unattainably

adv.in an unattainable manner or to an unattainable degree

"this house is unattainably expensive"

同义词：unachievably

Lethal autonomous weapons systems: Adapting to the future of unmanned warfare and unaccountable robots
The base-rate fallacy and the difficulty of intrusion detection
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The base-rate fallacy and its implications for the difficulty of intrusion detection
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How small can ``Nano'' be in a ``Nanolaser''?