he hurt his leg yesterday .He has difficulty walking now.句中为何walk用ing

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he hurt his leg yesterday .He has difficulty walking now.句中为何walk用ing

he hurt his leg yesterday .He has difficulty walking now.句中为何walk用ing
he hurt his leg yesterday .He has difficulty walking now.句中为何walk用ing

he hurt his leg yesterday .He has difficulty walking now.句中为何walk用ing
have difficulty doing sth 是固定词组用法 做某事有困难