调研的英文：
investigate and survey
investigation and research
research and study

参考例句：

Conduct an intensive and comprehensive investigation and study
作深入全面的调研

conduct a survey on the bearing capacity of the market
对市场承受力进行调研

In the 1980s there are more investigative reporters than ever before
到二十世纪八十年代，进行调研的记者空前增多。

We've reported some of the preliminary findings in the study.
我们已经把一些初步调查结果写进调研报告了。

investigate是什么意思：
v. 审查；调查，研究

No investigation, no recognition.
没有调查，就没有发言权。

You have to investigate into this affair.
你必须调查研究这件事。

They investigate corruption.
他们调查贪污。

survey是什么意思：
v. 俯瞰；测量，勘测；调查
n. 调查；审视；测量，勘测；纵览；概览

a comprehensive survey
全面的考察

sounding survey
海底测深；水深测量

This was an uncritical survey.
这是一个不中肯的概括。

investigation是什么意思：
n. 研究；调查

No investigation, no recognition.
没有调查，就没有发言权。

You have to investigate into this affair.
你必须调查研究这件事。

They investigate corruption.
他们调查贪污。