The fear of smallpox, which terrorized the eighteenth century, has no analogy(likeness) today.
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Somechildrendisplayanunquenchable难以抑制的curiosityabouteverynewthingtheyencounter.
The megaphone(microphone) makes the voice sound louder because it points sound waves in one direction and keeps them from spreading out in all directions.
Urbanrenewalprogramsstrivetoupgradeareasthatarebecomingslums.
In 1861 it seemed inevitable that the Southern states would break away from the Union.
With the acquisition of smaller companies by larger ones, the 1960's saw a wave of new conglomerates.