- changes in the Earth's orbit, ocean currents, and carbon dioxide levels
地球轨道、洋流 和二氧化碳水平的变化 - led to an abrupt cooling of the planet.
导致地球温度骤降 - The great Ice Age had begun...
冰河时期开始 - ...and it started with the tiniest of things.
从最细微之处开始变化 - On its own, a snowflake is a fragile, frozen wonder.
雪花本身就是一个脆弱的冰冻奇迹 - No two the same.
没有两片雪花完全相同 - But together, snowflakes changed the world.
但是雪花聚在一起 改变了世界
...and it started with the tiniest of things. 从最细微之处开始变化
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