[nán yǐ]
difficult to
hardly match; hardly equal
难以比拟
undeniable; irrefutable
难以否认
be difficult to estimate; inestimable
难以估计
be hard to get along with
难以相处
incredible
难以相信
unimaginable
难以想像
beyond one's control
难以约束
difficult to pin down; elusive; unintelligible
难以捉摸