A pledge of eternal love. This is the 083rd Ouyang Xiao word puzzle of Shuangseqiu in 20 years. Rounding is a method of calculating approximate values ??in mathematical operations. When encountering multiple decimal places, you can cut off a number of digits. If the first digit of the rounded part reaches five, add one to the last digit of the number taken, and if it is less than five, discard it. Red ball decoding 13141528.