The new recruit enlist in the armed forces, first must be learned how to fold up a military quilt, make it square and upright, be rolled up tidily, angularity like a" bean curd piece".
新兵入伍，首先要学习“叠被子”，把被子叠得方方正正，整整齐齐，有棱有角，像“豆腐块”。
Profile of a surface locates the surfaces in addition to controlling the angularity.
面轮廓度不仅能控制斜面的位置，而且能控制面的倾斜度。
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