worry at

• • 设法征服或说服：

    The scientist has worried at the problem during the last two months.

    科学工作者在过去的两个月里绞尽脑汁攻克难题。

  • 紧张地拉扯(某物)：

    a dog worrying at a bone

    一只撕咬着一块骨头的狗