pull at something
phrasal verb with pull verb uk/pʊl/ us/pʊl/
（常指多次）轻拉
to pull something quickly and usually repeatedly
The child pulled at his sleeve to get his attention. 那个孩子轻轻拉扯他的袖子以引起他的注意。
He pulled at his ear as he spoke. 他说话时老是在扯耳朵。