Eyespots,themostrudimentaryeyes,arefoundinprotozoan原生动物flagellates鞭毛虫,flatworms扁形虫,andsegmentedworms片段蠕虫.
A、hostile-lookingTheflowerbudofawaterlily百合opensatsunsetsince.itsopeningistriggered(commence).bythedecreasedlight.
Solidgeometryhasenabledastronomerstocalculatethepositionsoftheheavenlybodiesrelativetooneanother.
ThefuturesurvivalofthebaldeagleisstillanimportantAmericanecologicalconcern.
In1974HenryAaronbrokeBabeRuth'smonumentallifetimerecordof714homeruns.
MaryMcCarthyssatires讽刺文学arecouchedinaprosestylethathasaclassicprecision.
