The surveys showed that the weed distribution in rice fields in Shanghai was obviously various due to the differences of soil type, acid-base scale and terrain between areas.
调查结果表明，由于地区间土壤种类、酸碱度、地势差异，上海稻田杂草的分布和危害有明显区域性。
Every autumn we carefully weed a field of crops and loosen the soil to prevent weeds from growing in it.
每年秋天大家都要认真地芟秋，这样可以防止农田中生长杂草。
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