地方性性富集元素
localized enriched elements
慢性地方性氟中毒
chronic endemic fluorosis
endemic dental fluorosis
定性研究方法
Qualitative research method
质性研究方法
qualitative research methods
质性研究方法论
qualitative research methodology
地方地震监测预报工作
Local earthquake monitoring and prediction work
地方方案
regional climate change program