杭州市疾控中心的专家对200多名外来务工人员进行了现场调查，发现有半数以上是第一次外出打工，文化程度为初小的占大多数；

Hangzhou CDC expert on the more than 200 migrant workers on-site survey and found that more than half of the first migrant workers, elementary education for the majority;

youdao

杭州市疾控中心的专家对200多名外来务工人员进行了现场调查，发现有半数以上是第一次外出打工，文化程度为初小的占大多数；

Hangzhou CDC expert on the more than 200 migrant workers on-site survey and found that more than half of the first migrant workers, elementary education for the majority;

youdao