Starting from the early1990 s, the Chinese navy has invited the related experts to conduct exhaustive hydrological and geological freshwater exploration over19 islets on the Xisha Islands.
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- 从上个世纪90年代初期开始,海军多次邀请有关专家,对西沙淡水资源进行全面勘查,对19个岛礁进行了水文地质勘测。