With lasers scientists can probe many physical processes, such as combustion, once beyond our ken.视野
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Withlasersscientistscanprobemanyphysicalprocesses,suchascombustion,oncebeyondourken.视野
Despitetheproliferationofotherfastermodesoftransportation,therailroadsremainthelargestcarriersofintercityfreightintheUnitedStates.
Theflowerbudofawaterlily百合opensatsunsetsince.itsopeningistriggered(commence).bythedecreasedlight.
InthenortheasternUnitedStates,itrainsintermittently间歇地throughoutthespring.