Solid geometry has enabled astronomers to calculate the positions of the heavenly bodies relative to one another.
A、ontopofD
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InthenortheasternUnitedStates,itrainsintermittently间歇地throughoutthespring.
With lasers scientists can probe many physical processes, such as combustion, once beyond our ken.视野
Insect pests are among the leading causes of crop failure.
Blue－greenalgaegrowabundantlyinsaltmarshes.
Thefirstpaperwasmadefromthebarkofthemulberrytree.
