In the northeastern United States, it rains intermittently 间歇地 throughout the spring.
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Thewheelsofthefirstroadvehicleswerefashionedfromcrudestonedisks.
Themegaphone(microphone)makesthevoicesoundlouderbecauseitpointssoundwavesinonedirectionandkeepsthemfromspreadingoutinalldirections.
Solidgeometryhasenabledastronomerstocalculatethepositionsoftheheavenlybodiesrelativetooneanother.
The flower bud of a water lily 百合 opens at sunset since .its opening is triggered(commence) .by the decreased light.
With lasers scientists can probe many physical processes, such as combustion, once beyond our ken.视野