A record number of enrollment deposits pushed the yield rate to nearly 50%.
入学人数创纪录,使收益率接近50%。
2
When researchers can find high levels of exposure-for example, workers in factories that make or use the chemical-the number of subjects is often too small to yield reliable results.
Compared with the entire Web, the number of pages within a site is relatively small, so a simple search engine query might not yield enough or any results, even if there are good pages on the subject.