扩大到整个年度，今年一至三月的产出相当于下降了4.9%，为1948年有记录以来最为严重的下降。

Extended to the whole year, the drop in output in the January to March period is now equal to 4.9% - the worst since records began in 1948.

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成熟红杉平均200至240英尺高，直径为10到15英尺。

Average mature redwoods stand between 200 to 240 feet tall and have diameters of 10 to 15 feet.

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裂谷热潜伏期（从感染到出现症状）为2至6天。

The incubation period (interval from infection to onset of symptoms) for RVF varies from two to six days.

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