实地调查用英语怎么说？

实地调查

例句

• Methods Based on the, autoptical result, apply the fuzzy theory and multi - grade fuzzy comprehensive appraisement means. 方法依据实地调查资料, 运用模糊数学的理论与 多级 模糊综合评价方法.
• I also conducted a field study among the boys about their attitude to relationships... 我还对男孩子们进行了一项有关两性关系态度的实地调查。