The wheels of the first road vehicles were fashioned from crude stone disks.
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Some sea urchins海胆 have venomous (toxin) spines
Some cosmetics manufacturers attempt to capture the rose's unmistakable fragrance香味 in soaps and perfumes.
Formerly,intheUnitedStates,manynursesworkedasprivatedutynursesratherthaninhospitals.
When carbon is added to iron in the proper proportions , the result is steel.
The first important exposition in the United States was held in Philadelphia in 1876.