In the northeastern United States, it rains intermittently 间歇地 throughout the spring.
A、steadilyC
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Solid geometry has enabled astronomers to calculate the positions of the heavenly bodies relative to one another.
Themegaphone(microphone)makesthevoicesoundlouderbecauseitpointssoundwavesinonedirectionandkeepsthemfromspreadingoutinalldirections.
Somechildrendisplayanunquenchable难以抑制的curiosityabouteverynewthingtheyencounter.
Double Eagle in the first transatlantic balloon, was greeted by avid crowds in France.
TheNativeAmericaninterpreterSacajaweawasavaluablememberoftheLewisanddarkexpeditionin1805.
