problemistn.棋题设计(或研究)家problemn.问题；难题；习题adj.成问题的；难对付的problemistic innovation困境创新problem - perspective问题视角problem-solving model解题模式problem reduction method问题归约法problem-behavior graph问题-行为图, 问题行为图problem space hypothesis问题空间假设problem solving research解题研究problem-based teaching问题式教学problem analysis diagram问题分析图problem on lattice point格点问题

1. Problems arose at the very outset.
   刚刚起步，就遇到了困难