Once people get fat, it is hard for them to get thin; once they are used to breakfasting on chips and Coke, that's hard to change.
—旦人们发胖，'就很难瘦下来。一旦他们习惯于早餐吃炸土豆条和可乐，就很难改变过来。
2
Given this kind of success, it's hard to believe that Coke started out as a medicine that sold barely nine bottles a day.
在这样成功的情况下，很难相信可口可乐原来是一天几乎卖不到九瓶的药品。
3
Because coke sewage contains lots of hard-biodegraded and toxicant substances, it is considered one of the industrial waste water which is difficult to purify.