同根派生 bear cub相关词英汉例句In a den, a polar bear gives birth to a cub but the cub is stillborn.在一个洞穴里，一只北极熊生产了一个幼子，可是幼熊生下来就死了。Knut drew an outpouring of sympathy around the globe after his mother cast him out as a cuddly cub.克努特还是可爱的幼熊时遭母亲遗弃，引发全球同情。bear cub更多例句