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They go to the site of the change and drop a grain of soil.
他们前往发生变化的地方，然后丢下一粒泥土。
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Water quality is the key to guarantee quality of grain and soil.
在灌溉中水质是保证粮食和土地质量的非常关键的问题。
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Water quality is the key to guarantee quality of grain and soil.
在灌溉中水质是保证粮食和土地质量的非常关键的问题。
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