以下为句子列表：
英文: Data in Table 8 and numerous field observations show that because the soil is less disturbed, zero tillage results in less weed populations than conventional tillage.
中文: 表8的资料和一些大田观察资料表明，因土壤较少被扰动，免耕比传统耕作的农田杂草群体更少。
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英文: However, long term issues of zero tillage need to be explored to determine whether future problems or benefits may arise for this technology.
中文: 但还需要研究免耕的长期影响，以确定这项技术将来是有利还是有害。
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