而后在南半球
And then in the southern hemisphere
以上为机器翻译结果，长、整句建议使用 人工翻译 。
当流行性疾病在冬季逐渐加强其势力，先是在北半球，而后在南半球，这种极令人稍许放松的画面被极端事件所取代。
As the pandemic gains ground during the winter seasons, first in the northern hemisphere, later in the south, this largely reassuring picture will be undercut by extremes.
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