Thefearofsmallpox,whichterrorizedtheeighteenthcentury,hasnoanalogy(likeness)today.
A、occurrenceWith lasers scientists can probe many physical processes, such as combustion, once beyond our ken.视野
A mythical(imaginary) creature, the dragon was believed to have lion's claws, scaly skin, and fiery breath.
People who do not sleep enough tend to become irritable .
Blue－green algae grow abundantly in salt marshes.
An oversight 遗漏 (miss, overslaugh) in proofreading often results in printed errors.
