The dinosaur extinction.
恐龙失去了生存下来的生态竞争能力，生物学家不能解释它们的灭亡。
Dinosaurs are losing the ecological battle for survival, and biologists are at a loss to explain their demise.
另一个重要区别是：恐龙不知道是什么击中了它们，它们对自己的灭亡不负责任。
Another key difference: dinosaurs didn't know what hit them, and played no role in their own demise.
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