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1·The 2-millimeter-tall polyp, which forms vast coral reefs in the Caribbean Sea, holes up in its Marine fortress and waits for the moon to shift from its usual blue hue to a redder glow.

2毫米高的珊瑚虫(这种珊瑚组成了加勒比海广袤的珊瑚礁)，暗藏在自己的海洋堡垒里，等待着月光从平常的蓝色变化为红晕。

2·The actual animal that makes up the physical coral is called a polyp.

事实上组成活动的珊瑚的动物叫做珊瑚虫。

3·Each polyp lives inside a shell of aragonite, a type of calcium carbonate which is the hard shell we recognise as coral.

每一个珊瑚虫都寄生在一个文石壳内。文石是一种碳酸钙，也就是我们所说的珊瑚硬壳。

4·Coral is formed by certain types of polyp.

珊瑚是由某些水螅体构成的。