In the end, only one sun remained.

最后，天上只剩下一个太阳。

And there's only one sun in our solar system.

在我们的太阳系中只有一个太阳。

When one sun bear is showing a facial expression during play, the other one is showing exactly the same facial expression.

只要在玩儿的时候有一只马来熊做出面部表情，另一只就会做出一模一样的表情。