A mythical(imaginary) creature, the dragon was believed to have lion's claws, scaly skin, and fiery breath.
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Formulatedin1823,theMonroeDoctrineassertedthattheAmericaswerenolongeropentoEuropeancolonization.
Somechildrendisplayanunquenchable难以抑制的curiosityabouteverynewthingtheyencounter.
AlthoughtheCarbon14methodofdatingoldobjectsisnotfoolproof,itisthebestmethodavailableatpresent
Thecontrolsofmostmodernairplanescanbeoperatedeithermanuallyorautomatically.
Withlasersscientistscanprobemanyphysicalprocesses,suchascombustion,oncebeyondourken.视野