Communicationisoneofthemostimportantbondsthatholdculturalsystemstogether.
A、obligationsBythenineteenthcentury,embroideryonmen'sclothinghadvirtuallydisappearedexceptfortheoccasionaldecorativevestandtie.
Formerly,intheUnitedStates,manynursesworkedasprivatedutynursesratherthaninhospitals.
In1974HenryAaronbrokeBabeRuth'smonumentallifetimerecordof714homeruns.
Eyespots,themostrudimentaryeyes,arefoundinprotozoan原生动物flagellates鞭毛虫,flatworms扁形虫,andsegmentedworms片段蠕虫.
Thecontrolsofmostmodernairplanescanbeoperatedeithermanuallyorautomatically.
