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发布时间： 2020-05-21
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The first important exposition in the United States was held in Philadelphia in 1876.
Formulated in 1823, the Monroe Doctrine asserted that the Americas were no longer open to European colonization.
A mythical(imaginary) creature, the dragon was believed to have lion's claws, scaly skin, and fiery breath.
Formerly , in the United States, many nurses worked as private duty nurses rather than in hospitals.
The future survival of the bald eagle is still an important American ecological concern.
Mary McCarthy s satires 讽刺文学 are couched in a prose style that has a classic precision.
In 1974 Henry Aaron broke Babe Ruth's monumental lifetime record of 714 home runs.
Bats fly, rather than glide, and thus are the only mammals capable of true flight.
The company issues an annual report every March.
Some sea urchins海胆 have venomous (toxin) spines