咬;撕扯;摇晃;拉扯
worry at sth
to bite sth and shake or pull it
Rebecca worried at her lip.丽贝卡咬着嘴唇。
思考,苦想(解决办法)
to think about a problem a lot and try and find a solution
释义来自《牛津高阶英汉双解词典》第 9 版