A.difficulty 可以是可数(表示具体)也可以不可数名词(表示抽象).如:
have difficulty in doing / with sth.做……有困难.表示抽象,用不可数
come across difficulties/ overcome difficulties 表示具体困难,用可数.
A.difficulty 可以是可数(表示具体)也可以不可数名词(表示抽象).如:
have difficulty in doing / with sth.做……有困难.表示抽象,用不可数
come across difficulties/ overcome difficulties 表示具体困难,用可数.