1918年的那场流感大流行期间，当病毒首次在春季出现时，引起的症状相对轻微，但是到了那年秋天，它卷土重现时，却来势更猛。
In the 1918 pandemic, the virus was relatively mild when it first appeared in the spring, but it came back with a vengeance in the fall.
1572年11月，这颗超新星首次出现，当时它几乎和金星一样明亮，甚至在白天也能看到。
When the supernova first appeared in November 1572, it was as bright as Venus and could be seen in the daytime.
在全球所有已售出的手机中，10款中有4款是诺基亚的，而由于消费者纷纷地购买iPhone手机，诺基亚上周公布，在十多年里，它首次出现了季度亏损。
Nokia, which makes almost four in ten of all the mobile phones sold worldwide, last week reported its first quarterly loss in more than a decade as its customers defect to the iPhone.
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