Formulated in 1823, the Monroe Doctrine asserted that the Americas were no longer open to European colonization.

In the northeastern United States, it rains intermittently 间歇地 throughout the spring.

Despite the proliferation of other faster modes of transportation, the railroads remain the largest carriers of intercity freight in the United States.

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

Somechildrendisplayanunquenchable难以抑制的curiosityabouteverynewthingtheyencounter.