Eyespots, the most rudimentary eyes, are found in protozoan原生动物 flagellates 鞭毛虫 , flatworms 扁形虫 , and segmented worms片段 蠕虫 .

Formerly,intheUnitedStates,manynursesworkedasprivatedutynursesratherthaninhospitals.

In literature, caricatures讽刺画 usually contain verbal exaggeration through which the writer achieves comic and often satiric 讽刺effects.

Whencarbonisaddedtoironintheproperproportions,theresultissteel.

In 1974 Henry Aaron broke Babe Ruth's monumental lifetime record of 714 home runs.