New words：

investigation /ɪnˌvestɪˈɡeɪʃn/ n.侦查；调查；

必记高频搭配

start an investigation (into sth)（对某事展开一次调查）
The teacher started an investigation into who lost the classroom key.

carry out an investigation（开展调查）
Scientists carry out an investigation into the rare animal.

conduct an investigation（进行调查，正式用法，写作加分）
The company conducted an investigation into the product problem.

conduct [ˈkɑnˌdʌkt] v.实施；执行；表现；引导

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