not unknown reason
并非未知原因
以上为机器翻译结果，长、整句建议使用 人工翻译 。
Whatever was out there was still unknown, scientists had not yet been able to determine its nature, caution was advised but there was no reason for panic, our job was to stay tuned and sit tight and await further developments.
NEWYORKER: The Invasion from Outer Space
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