短語詞組短語gas source concentration region 氣源集聚位置water source conservation region 水源保護區(qū)source e region 源地source -region electromagnetic pulse 源區(qū)電磁脈沖large river source region 大河源區(qū)yangtze river source region 黃河源區(qū)earthquake source region 震源區(qū) 返回 source region