③名词+in

ache in(在⋯部位疼) delight in(高兴)

expert in(在⋯方面有专长) interference in(干涉,干预)

no point in doing(做⋯没道,没有意义) trust in(相信)

confidence in(对⋯有信心) difficulty in(在⋯方面有困难) interest in(有兴趣)

pain in(在⋯部位疼痛) proficiency in(熟练,精通)