A new method of tracing precipitation isoline is introduced in term of the character of rain spot and isoline.

针对雨量站点及等雨量线的特征，讨论了一种新的等雨量线追踪途径。

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Acid rain, as one of the major environmental problems man is confronted with, is becoming a hot spot in the study of soil science and ecology.

酸雨是人类当前面临的最严重的环境问题之一，并日益成为土壤学和生态学研究的热点。

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It dumped around 7 inches of rain on Oklahoma City in the span of a few hours and made the tornado difficult to spot for motorists trying to beat it home, said Bruce Thoren, a meteorologist with National Weather Service in Norman.

WSJ: Tornado-Hit Oklahoma Struck Again; Mother and Baby Dead