Eyespots, the most rudimentary eyes, are found in protozoan原生動物 flagellates 鞭毛蟲 , flatworms 扁形蟲 , and segmented worms片段 蠕蟲 .
A、hostile-lookingC
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In 1974 Henry Aaron broke Babe Ruth's monumental lifetime record of 714 home runs.
In calculating the daily calorie requirements for an individual, variations in body size, physical activity, and age should be taken into account.
Someseaurchins海膽havevenomous(toxin)spines
When carbon is added to iron in the proper proportions , the result is steel.
The wheels of the first road vehicles were fashioned from crude stone disks.
