9表示至少输出9个字符,如果不足则自动以空格补足: 12345678
9表示至少输出9个字符,如果不足则自动以空格补足: 12345
8表示精确到小数点后8位:12345.12345679
8表示精确到小数点后8位,如果不足则自动以0补足:12345.12345000
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