worry at something
phrasal verb with worry verb uk/ˈwʌr.i/ us/ˈwɝː.i/
(OBJECT)
反复逗弄
to shake, pull at, or touch something repeatedly
The dog was worrying at its bone. 狗在反复撕咬着骨头。
(PROBLEM)
mainly UK不断努力;反复尝试
to keep trying to find a way of solving a problem
She'll worry at those figures until she's sure they've been done correctly. 她会反复验算那些数字，直到确定计算结果无误为止。