river-deltaBNC²³⁶²¹³⁺¹ 基本例句 河流三角洲 Dongguan Guangsu Laser Equipment Co. , Ltd is located in Dongguan city in the Pearl-river-delta- region in China, where the industry is well developed. 东莞市光速激光科技有限公司是一家集光、机、电一体化的高新技术企业，位于中国工业发达的珠三角地区东莞市。 amazing-network-marketing