泰国河畔，成千上万萤火虫同步发光之谜
Every night, along a quiet river in Thailand, something magical happens. Thousands of tiny lights start to flash in the trees. These lights come from fireflies. They are not ordinary fireflies. They flash together, all at the same time.
The fireflies live in mangrove trees near the water. As the sun sets, they begin to glow. First, a few lights blink here and there. Then, slowly, all the fireflies join in. Soon, the whole tree flashes with a steady rhythm.
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