Somechildrendisplayanunquenchable难以抑制的curiosityabouteverynewthingtheyencounter.
Thecontrolsofmostmodernairplanescanbeoperatedeithermanuallyorautomatically.
Withtheacquisitionofsmallercompaniesbylargerones,the1960'ssawawaveofnewconglomerates.
Solidgeometryhasenabledastronomerstocalculatethepositionsoftheheavenlybodiesrelativetooneanother.
InthenortheasternUnitedStates,itrainsintermittently间歇地throughoutthespring.
Themegaphone(microphone)makesthevoicesoundlouderbecauseitpointssoundwavesinonedirectionandkeepsthemfromspreadingoutinalldirections.