Does good luck account for one factor of success? Some people say that success comes all from hard-working and luck has nothing to do with that. But I don't think such statement is accurate. In my view,  hard-working and good luck are both factors for one to achieve success, though one can never achieve success without the former.
 
To begin with, it is obvious that hard-working is vital to achieving success, in that hard work makes sure we fully understand the problem we are about to solve and maks us practiced in solving the same kinds of  problems. Take language learning for example, to master a new language, one has to go over and over again the knowledge that he learned in order not to forget them. Large amount of work such as analysing, comparing, memorizing also need to be done. All of the above call for a great deal of hard work. As a conclusion, no one can ever achieve success without hard-working.
 
At the same time,  luck can sometimes gives an impetus to success. One possibility is that we accidentally meet some good advicer and receive valuable advice, which may help us find shortcut thus promote our imrovement.  A friend of mine used to have trouble memorizing words when learning English, one day a teacher told him that he should remember things by imagination rather than mechanically copy the words, he took that advice and greatly improved his work. Later he achieve an award on an English competition. He said to me the teacher's adcice ignited his though, without that luck meeting him he would never have reached that  achievement.
 
From what have been discussed above, it can be directly concluded that, on one hand hard-working is the basis of whether we can achieve success, on the other hand, good luck may also help. In a word, hard-working and good luck are both what it takes to become successful.