People who do not sleep enough tend to become irritable .
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Creamoftartar酒石,aweakacid,canbeaddedtoeggwhitestohelpthemfoam泡沫whentheyarebeaten
In1861itseemedinevitablethattheSouthernstateswouldbreakawayfromtheUnion.
Whencarbonisaddedtoironintheproperproportions,theresultissteel.
DoubleEagleinthefirsttransatlanticballoon,wasgreetedbyavidcrowdsinFrance.
Eyespots,themostrudimentaryeyes,arefoundinprotozoan原生动物flagellates鞭毛虫,flatworms扁形虫,andsegmentedworms片段蠕虫.