The first paper was made from the bark of the mulberry tree.
B
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Thewheelsofthefirstroadvehicleswerefashionedfromcrudestonedisks.
Blue-greenalgaegrowabundantlyinsaltmarshes.
Communicationisoneofthemostimportantbondsthatholdculturalsystemstogether.
Someseaurchins海胆havevenomous(toxin)spines
Withlasersscientistscanprobemanyphysicalprocesses,suchascombustion,oncebeyondourken.视野