... b.这类名词表示一般物质时，不用冠词。例： Rain falls in summer; snow falls in winter. 夏天下雨，冬天下雪。 Man can't live without air. 没有空气人不能活。 ...
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Rain falls in summer; snow falls in winter.
夏天下雨，冬天下雪。
Most of India’s crucial rain is brought by the summer monsoon, which falls, with luck, in just a few weeks between June and September.
基本上印度最主要的降雨都是由夏季季风带来的。 即使在好的年节，这些雨水也只集中在六月和九月之间的一小段时间里。
The draining of Kazakhstan's once-vast Aral Sea has made regional temperatures hotter in summer and colder in winter, and rain now rarely falls.
哈萨克斯坦曾经广阔的咸海的排干工程使得那里的夏天天气异常炎热、冬天天气异常寒冷，而且很少下雨的情况。
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