Batsfly,ratherthanglide,andthusaretheonlymammalscapableoftrueflight.
A、straightSolidgeometryhasenabledastronomerstocalculatethepositionsoftheheavenlybodiesrelativetooneanother.
Themegaphone(microphone)makesthevoicesoundlouderbecauseitpointssoundwavesinonedirectionandkeepsthemfromspreadingoutinalldirections.
Thecontrolsofmostmodernairplanescanbeoperatedeithermanuallyorautomatically.
MaryMcCarthyssatires讽刺文学arecouchedinaprosestylethathasaclassicprecision.
Thefirstpaperwasmadefromthebarkofthemulberrytree.
