The Native American interpreter Sacajawea was a valuable member of the Lewis and dark expedition in 1805.

An oversight 遗漏 (miss, overslaugh) in proofreading often results in printed errors.

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

Insect pests are among the leading causes of crop failure.

Urban renewal programs strive to upgrade areas that are becoming slums.

Alligators still exist in some of the dank 潮湿 swamps and bayous小海湾 of Alabama's coastal regions.

Communication is one of the most important bonds that hold cultural systems together.

In calculating the daily calorie requirements for an individual, variations in body size, physical activity, and age should be taken into account.

The controls of most modern airplanes can be operated either manually or automatically.

While Billie Holiday did not invent the music called "the blues", she most assuredly helped popularize it.