Communicationisoneofthemostimportantbondsthatholdculturalsystemstogether.
A、obligationsTheSalkvaccineisamajorfactorinthefighttoeradicatepolio.
Somechildrendisplayanunquenchable难以抑制的curiosityabouteverynewthingtheyencounter.
Incalculatingthedailycalorierequirementsforanindividual,variationsinbodysize,physicalactivity,andageshouldbetakenintoaccount.
Withlasersscientistscanprobemanyphysicalprocesses,suchascombustion,oncebeyondourken.视野
Bythenineteenthcentury,embroideryonmen'sclothinghadvirtuallydisappearedexceptfortheoccasionaldecorativevestandtie.
