The controls of most modern airplanes can be operated either manually or automatically.
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Urbanrenewalprogramsstrivetoupgradeareasthatarebecomingslums.
Somechildrendisplayanunquenchable难以抑制的curiosityabouteverynewthingtheyencounter.
In1974HenryAaronbrokeBabeRuth'smonumentallifetimerecordof714homeruns.
DoubleEagleinthefirsttransatlanticballoon,wasgreetedbyavidcrowdsinFrance.