到了每年的年底即年三十的时候，就不仅是新旧两天的更替，也是新旧岁的更替，称之为“交子”。
到了每年的年底即年三十的時候，就不僅是新舊兩天的更替，也是新舊歲的更替，稱之為“交子”。
dào liǎo měi nián de nián dǐ jí nián sān shí de shí hou ， jiù bù jǐn shì xīn jiù liǎng tiān de gēng tì ， yě shì xīn jiù suì de gēng tì ， chēng zhī wéi “ jiāo zi ”。
Arriving at the end of each year (that is, the last day of the lunar calendar) wasn't just a new day taking over from the previous one, but also a new year taking over from the previous one, and this was called 'first exchange'.