英和和英

make a survey of

prosecute an inquiry

do research

to make a close investigation―a minute investigation

matters requiring investigation―matters for investigation

Carry out an inspection

Conduct an inspection

do research

inquire into

do a survey

exploratory reconnaissance

under investigation

study in the field

Please proceed with the investigation―go on with the investigation―go ahead with the investigation.

make a survey of public opinion

launch an inquiry

The inspection will be carried out.

actual investigation―personal investigation

exact investigation

Enactment of inspection

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

As a result of inspection...

to probe a matter to the bottom

hold an official inquiry

to hold an inquest （over a corpse）

to take the census

make a search (for)

a full-dress investigation

by inquiry

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