檢視约定（张学友）的原始碼

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|<center>'''张学友'''<br><img src="https://n.sinaimg.cn/sinakd10016/266/w640h426/20210708/495d-ksmehzs9795164.jpg " width="280"></center><small>[https://cn.bing.com/images/search?view=detailV2&ccid=JYwDBk8Y&id=58E203045BC8E949EFAE1515C230D07E6EA98DCD&thid=OIP.JYwDBk8YyiRCHejnwStTIAHaE7&mediaurl=https%3A%2F%2Fn.sinaimg.cn%2Fsinakd10016%2F266%2Fw640h426%2F20210708%2F495d-ksmehzs9795164.jpg&exph=426&expw=640&q=%e5%bc%a0%e5%ad%a6%e5%8f%8b%e5%9b%be%e7%89%87&simid=607988810522572695&form=IRPRST&ck=AC29644F89A7806035E47673834346B0&selectedindex=102&ajaxhist=0&ajaxserp=0&vt=0&sim=11 圖片來自百度]</small> 
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'''约定（张学友）'''