随着近地轨道（LEO）向更多非专业性的卫星开放，它们可能会构成越来越大的威胁。

As LEO opens up to more amateur satellites, they may pose an increasing threat.

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近几十年来，环境威胁已经超越了地域边界，发展到全球范围，最令人不安的是，环境威胁正以极快的速度成倍增长。

In recent decades, environmental threats have expanded beyond regional boundaries to have global reach and, most hauntingly, are multiplying at a dizzying rate.

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仅在今年，世卫组织就调查了近400起严重威胁健康的疾病传闻，主要涉及传染病。

In this year alone, WHO has investigated nearly 400 rumours of acute threats to health, mostly from infectious diseases.

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