新西兰洞穴中的“星空”：发光蠕虫的奇妙秘密
Waitomo Caves are in New Zealand. Inside, tiny creatures make a soft blue-green light. These are called glow-worms. The dark cave walls look like a night sky full of stars.
The glow-worms are not real worms. They are the babies of a small flying insect. Each one hangs a sticky silk thread from the ceiling. The thread can be as long as your finger.
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