n. secret
adj. top-secret
这是一个极机密的任务。
作为一个结果，这是一个极机密的事，我与你。
As a result of that, it is an extremely confidential matter between me and you.
但是最有说服力的证据显示：该物体既不是飞碟，也不是探空气球，而是一个代号为“莫古尔计划”的高飞行速率的、极机密的军事气球。
Yet the best evidence suggests that it was neither a flying saucer nor a weather balloon, but instead a high-altitude, top-secret military balloon dubbed Project Mogul.
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