restriction,curb,restraint,constraint,check,impediment,obstacle,obstruction,block,rein,barrier,damper,clampdown,brake,.......................
本身句子就有問題,important of a company就不通了。important to才是通順的用法。跟他答說"The question is based on flawed grammar, unable to answer!" [句子是建立在瑕疵的文法,故無法回答!!]