美国研究者称他们现在知道为什么流感病毒在冬天而不在夏天传播。
American researchers say they now know why the influenza virus spreads in the winter and not in the summer.
对我来说是很方便的，因为我可以，在冬天的时候保持温暖上课而不是花两个小时坐公共汽车而且心不在焉的上课。
It is much more convenience to me because I can stay warm to have class in the winter time instead of spending two hours on the bus and physically attend class.
威胁无处不在，而冬天在很短的几个月后就要来临！
Danger lies at every turn and winter is only a few short months away!
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