Withlasersscientistscanprobemanyphysicalprocesses,suchascombustion,oncebeyondourken.視野
A、understandingThewheelsofthefirstroadvehicleswerefashionedfromcrudestonedisks.
TheSalkvaccineisamajorfactorinthefighttoeradicatepolio.
Somechildrendisplayanunquenchable難以抑制的curiosityabouteverynewthingtheyencounter.
Bythenineteenthcentury,embroideryonmen'sclothinghadvirtuallydisappearedexceptfortheoccasionaldecorativevestandtie.
Someseaurchins海膽havevenomous(toxin)spines
