假定英语课上老师要求同桌之间交换修改作文，请你修改你同桌写的以下作文。文中共有10处语言错误，每句中最多有两处。每处错误仅涉及一个单词的增加、删除和修改。
增加：在缺词处加一个漏字符号（∧），并在其下面写出该加的词。
删除：把多余的词用斜线（\）划掉。
修改：在错的词下画一横线，并在该词下面写出修改后的词。
注意：
1）每处错误及其修改仅限一词；
2）只允许修改10处，多者（从第11处起）不计分。
Challenges of life remind me of my days in senior high school which I joined in the military training. It was the first time I have lived far away from my home, so I found difficult to fit in. And the trained officer was strict with me. I once think I could not stick to the end. And anyway, I succeeded. The trials made it much easy for me to adapt to life, and the difficulty I came across have now all become a precious memory in my life. In a short, I have learned to regard the challenges of life like a stepping stone to future success.
角，则每根支架中承受的压力大小为
