- Hesquintedthroughthepeephole.Aone-waypeepholeinadoor.Lookthroughthedoor'speepholebeforeopeningyourdoor.threwthedeadboltclosedandpeekedoutthepeephole.Analysisofstratadynamiccrackcharacteristicsuponfracturedroofbasedonopticalpeepholereargunsighthaving...
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