and the mother has led her cubs a mile from the den. 母熊已经带领幼熊离巢1英里远
Being so small, the cubs are easily chilled and they will be more comfortable resting in the den. 幼小的熊崽很容易冻僵 躲在洞穴中可能会更舒服些
and the cubs must have the shelter of the den. 熊崽们必须回到洞中避寒
She has been in her den the whole winter. 整个冬天 它都在洞穴里度过