违背农药安全间隔期；
随机抽取668名农户进行问卷调查，内容涉及施用农药的种类、频次、施药安全间隔期等。
The questionnaires were distributed to 668 families randomly in rural areas. The questions involve in the categories of the pesticides and frequencies of use and safe interval period and so on.
一期试验：这些首次在人体上进行的试验评估一个新药应该如何给药(口服，注射入血还是肌肉注射)，给药间隔和给药的安全剂量。
Phase I trials: These first studies in people evaluate how a new drug should be given (by mouth, injected into the blood, or injected into the muscle), how often, and what dose is safe.
一期试验：这些首次在人体上进行的试验评估一个新药应该如何给药(口服，注射入血还是肌肉注射)，给药间隔和给药的安全剂量。
Phase I trials: These first studies in people evaluate how a new drug should be given (by mouth, injected into the blood, or injected into the muscle), how often, and what dose is safe.
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