英和和英

actual investigation―personal investigation

do research

inquiry into one's birth and parentage―inquiry into one's antecedents

make a survey of public opinion

under investigation

make a survey of

exact investigation

to make a close investigation―a minute investigation

inquire into

a full-dress investigation

close investigation

a thorough investigation

a narrow examination

attentive consideration and meditation

exploratory reconnaissance

close investigation―thorough investigation

matters requiring investigation―matters for investigation

As a result of inspection...

study in the field

a house‐to‐house survey

a survey on the degree of satisfaction

a comprehensive survey

census-taking

an on‐the‐spot survey

a feasibility study

a review of the literature

within the scope of an investigation

to investigate a matter thoroughly―probe the matter to the bottom

to investigate a matter closely―sift the matter to a crumb

to take the census