因为这是提升自己学习成绩的关键所在，有难度才能提高，如果一个人一辈子只做1+1=？
Because this is the key to improve their academic performance, it is difficult to improve, if a person only 1+1=?
因为这是提升自己学习成绩的关键所在，有难度才能提高，如果一个人一辈子只做1+1=？
Because this is the key to improve their academic performance, it is difficult to improve, if a person only 1+1=?
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