• 复杂的游戏

difficult of难以, 很难difficultadj.困难的；艰难的；(人)难对付的；不易相处的difficult medical services看病难difficulties and hardships艰难困苦difficult-to-grind ore吐块difficult and distribution难度分配difficult-to-cut alloy难加工合金difficult- pretty events表现难美类项群difficulties in practicing实践困境difficult to get along with不好相处difficulties in development发展难题difficulties and challenges困难与挑战