恐龙大约在六千五百万年前就消失了。科学家试着解释它们消失的原因。

Dinosaurs disappeared about 65 million years ago. Scientists try to explain their disappearance.

youdao

恐龙大约在六千五百万年前就消失了。科学家试着解释它们消失的原因。

Dinosaurs disappeared about 65 million years ago. Scientists try to explain their disappearance.

youdao