The scientificsampling size and suitable sampling number under different densities on the two pests were consequently determined.
据此，确定了两种害虫的科学抽样方式和不同密度下的合理抽样数量。
2
It's not a scientific survey, since those polled are a self-selected sampling and tend to feel strongly about certain sites, both pro and con.
这并不是一个科学调查，而是基于自由选择投票并且考虑到所选网站的优缺点产生的。
3
CTR applies the scientific monitoring method combining random sampling and whole-process video recording to ensure impartiality of monitoring process and completeness of sampling.