xiān zhèngㄒㄧㄢ ㄓㄥˋ先郑（先郑）指东汉郑众。郑众和时代稍后的郑玄都曾注解古代经书。后代注疏家为分别二郑，以郑众曾任大司农，因称郑司农；又因郑众辈行在先，故称众为先郑，玄为后郑 。
郑昌业对老伴说：“趁着咱们腿脚还麻利，咱就先难后易，从远到近开始吧。”
Then he said to his wife: "Let's start from distant destinations with difficult terrains when we can still move about, leaving the easier-to-reach ones for later.
郑昌业对老伴说：“趁着咱们腿脚还麻利，咱就先难后易，从远到近开始吧。”
Then he said to his wife: "Let's start from distant destinations with difficult terrains when we can still move about, leaving the easier-to-reach ones for later."
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