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see someone through是英语习语,请看上海译文出版社2002版《COBUILD英汉双解词典》的解释：
If someone or something sees you through a difficult time in your life,they give you help during this time.帮...度过（难关）.
并有举例：
He was a great friend of mine and saw me through all the hard times.他是我的好朋友,所有的苦日子都是他帮我熬过去的.
据此,你所给的句子可译为：
只有靠努力,你才能挺过这一关.