People who do not sleep enough tend to become irritable .
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Eyespots,themostrudimentaryeyes,arefoundinprotozoan原生动物flagellates鞭毛虫,flatworms扁形虫,andsegmentedworms片段蠕虫.
TheSalkvaccineisamajorfactorinthefighttoeradicatepolio.
InthenortheasternUnitedStates,itrainsintermittently间歇地throughoutthespring.
HowmanypeopleareawarethatadancerwiththeNewYorkCityBallettypicallywearsoutaminimumoftwohundredpairsoftoeshoesperyear?
Bythenineteenthcentury,embroideryonmen'sclothinghadvirtuallydisappearedexceptfortheoccasionaldecorativevestandtie.