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。
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。
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。
Coral is formed by certain types of polyp.
珊瑚是由某些水螅体构成的。
Coral is formed by certain types of polyp.
珊瑚是由某些水螅体构成的。
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