Scratch, scratch, went her sharp front paws until she had made a little hole in the ground.

她用锋利的前爪用力地刨啊刨，直至在地上挖了个小洞。

It has six sharp front teeth for cutting-four in the upper jaw, and two in the lower jaw.

兔子嘴前面长着六颗锋利的牙齿, 上颌有四颗, 下颌有两颗。

They obtain the wood for their dams and huts by gnawing through the branches of trees, and even through the trunks of small ones, with their sharp front teeth.

海狸用自己那尖而长的前牙不断地噬咬大树的细枝，它们甚至还会咬断小树的主干，从而为自己的小屋和水坝储存木材。