The bear emerged from her den and started to charge him and his assistant .
北极熊也从洞穴钻出来,朝他和他的助手冲过去。
This mated pair was found in a deep-sea den off the coast of maine .
这对狼鱼夫妇于缅因州海岸边的一处深海巢穴处被人们发现。
According to popular legend , if the groundhog leaves his den and sees his shadow , it 's both a sunny day and a sign that we 're in for six more weeks of winter .
In recent decades running a business or household with a conservative balance-sheet has been a bit like being the only person in an opium den not to inhale .