全球气候变化是北京沙尘暴出现的外部原因；人口压力过大，人地关系不协调则是北京沙尘暴形成的内部原因。
Outside cause of Beijing sandstorm is global climatic change, inner cause is overweight of population pressure and non-harmonious population-land relations.
中国中央气象台在沙尘暴到达北京前的几个星期就能预见到，但是风暴的威力有时是惊人的。
The Chinese Central Weather Station can forecast a sandstorm some weeks before it arrives in Beijing, but the strength of the storm sometimes surprises people.
不过现在北京在改善环境，沙尘暴没有以前那么严重了。不过春天的确不是这里最好的季节。
Beijing is improving its environment and the sandstorms aren't as severe as before. But spring is definitely not the best season here.
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