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have difficulty with sth中difficulty要不要遍复数?

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have difficulty with sth中difficulty要不要遍复数?
have difficulty with sth中difficulty要不要遍复数?
difficulty 可以是可数(表示具体)也可以不可数名词(表示抽象).
有以下两个典型词组
have difficulty in doing / with sth.表示抽象,用不可数
come across difficulties/ overcome difficulties 表示具体困难,用可数.