“想要自己更好”意味着你必须保持前进，学习和提高自己因为仍然有提高的空间(更不用说还有一只熊在追赶你)。
Thinking you're better means you have to keep pushing, learning and improving because there is still room for improvement (not to mention there is a huge bear running behind you).
北极熊和棕熊在大约15万年前进化为不同的物种，但是自那时起开始出现偶然的杂交。
Polar bears and brown bears became distinct species around 150, 000 years ago, but have occasionally interbred ever since.
视频显示，熊追逐了墨菲一小段距离，但不久后，19岁的墨菲加速前进，就甩掉了它。
The video shows the bear chasing the 19-year-old a short distance, but she soon picks up speedand escapes.
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