knocking [nɒkɪŋ]

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附加级

n.爆震音，卡答卡答的故障声音v.敲，击，打( knock的现在分词 )；（心）怦怦跳；把…撞击成（某种状态）；批评

The newspapers are too fond of knocking the team. 报纸专爱挖苦那个队。来自《简明英汉词典》
I could hear knocking, as if someone wanted out. 我听到敲门声，好像有人想要出去。来自《简明英汉词典》