The first important exposition in the United States was held in Philadelphia in 1876.
更新时间:2024-11-15 23:46:26 A、exhibitionA
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Blue－greenalgaegrowabundantlyinsaltmarshes.
Thewheelsofthefirstroadvehicleswerefashionedfromcrudestonedisks.
Solidgeometryhasenabledastronomerstocalculatethepositionsoftheheavenlybodiesrelativetooneanother.
Eyespots,themostrudimentaryeyes,arefoundinprotozoan原生动物flagellates鞭毛虫,flatworms扁形虫,andsegmentedworms片段蠕虫.
Cometsarestillregardedwithawebysomepeople.
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