L6-3M 做 CIPAL AXEs oF T∈RT INGENE RAL THE TNERTI MiTk Ix Ts FULLY POPULATE D → BUT CAW ALWAYS FIND A NEW FRAM日 u-∞N♀z (REACHED BY A RoTAT (oN)FoR WHICH TE工RT丹AATR以xS0A导NAL 工身 工 工 工 T*,IY'Z2' CALLED PRINCIPALMOMENTS F TNERTIA x'Y'Z CALLED PRINCIPAL AXEs DIAGDNAL T MAKES THINGS MUCH EASIER: H工 Hk=工b 工 Y wY j T工中下叫2于