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世上没有100分的婆婆,也没有100分的儿媳妇,分别只有50分的两个人,如果相减就得0分,如果相加就是100分。
There are no 100-year-old mother-in-law and no 100-year-old daughter-in-law who have only 50 points. If they are subtracted, they have 0 point, and if they add up, 100 points.