mail sampling
常见例句
- Knowledge Networks used traditional telephone and mail sampling methods to randomly recruit respondents.
MSN: Poll reveals baby boomers' retirement fears - MessageLabs, the email-filtering company that Symantec acquired in 2008, posted a set of word maps today measuring the frequency of terms in spam emails from a random one-week sampling of junk mail pulled from the most prolific spam-spewing botnets.
FORBES: The Most Common Words In Spam Email 返回 mail sampling