A female polar bear gives birth, usually to twins, in a snow den in winter.

冬天，雌性北极熊会在洞穴里生育，通常都会产下双胞胎。

youdao

A female polar bear gives birth, usually to twins, in a snow den in winter.

冬天，雌性北极熊会在洞穴里生育，通常都会产下双胞胎。

youdao