在我国广阔的南海上,散布着200多个岛屿、暗礁和暗沙等。它们好像一颗颗宝石,镶嵌在海面上。可是谁能想到:这繁星点点般的群岛,竟是由小小的珊瑚虫“建造”的呢! 珊瑚虫生活在热带浅海里。它们个子小,但数量多,繁殖快。它们成群结队地附着在岩石上生长,分泌石灰质,形成坚硬的骨骼。老一代珊瑚虫死后,新一代又在“父母”的骨骼之上繁殖生长起来,并 Over the vast South China Sea in our country, there are more than 200 islands, reefs and shoals. They are like a gem, embedded in the sea. But who can think of it: This star-studded archipelago was actually “built” by tiny corals that live in shallow tropical seas. They are small but large in number and reproduce fast. They grow in droves, clinging to the rocks, secrete lime, forming hard bones. After the death of the coral polyps of the older generation, the new generation multiplies again and again over the skeleton of the “parents”