ps：请假，明天上午补上。

duienginelicensethemitlicense(mit)copyright(c)<year><copyrightholders>permissionisherebygranted，freeofcharge，toanypersonobtainingacopyofthissoftentationfiles(the“software“)，todealinthesoftwarewithoutrestriction，includingitationtherightstouse，copy，modify，merge，publish，distribute，sublicense，and/orsellcopiesofthesoftthesoftwareisfurnishedtodoso，subjecttothefollowingconditions:

theabovecopyrightnoticeandthispermissionnoticeshallbeincludedinallcopiesorsubstantialportionsofvided“asis“，itedtotheerchantability，fitnessforaparticularpurposeandnonieauthorsorcopyrightholdersbeliableforanyclaim，damagesorotherliability，whetherinanactionofcontract，tortorother，outoforinconnectionwiththesoftwareortheuseorotherdealingsinthemitlicense(mit)copyright(c)<year><copyrightholders>permissionisherebygranted，freeofcharge，toanypersonobtainingacopyofthissoftentationfiles(the“software“)，todealinthesoftwarewithoutrestriction，includingitationtherightstouse，copy，modify，merge，publish，distribute，sublicense，and/orsellcopiesofthesoftthesoftwareisfurnishedtodoso，subjecttothefollowingconditions:theabovecopyrightnoticeandthispermissionnoticeshallbeincludedinallcopiesorsubstantialportionsofvided“asis“，itedtotheerchantability，fitnessforaparticularpurposeandnonieauthorsorcopyrightholdersbeliableforanyclaim，damagesorotherliability，whetherinanactionofcontract，tortorother，outoforinconnectionwiththesoftwareortheuseorotherdealingsinthesoftware.

theabovecopyrightnoticeandthispermissionnoticeshallbeincludedinallcopiesorsubstantialportionsofvided“asis“，itedtotheerchantability，fitnessforaparticularpurposeandnonieauthorsorcopyrightholdersbeliableforanyclaim，damagesorotherliability，whetherinanactionofcontract，tortorother，outoforinconnectionwiththesoftwareortheuseorotherdealingsinthesoftware.(未完待续。)