- Although the Carbon 14 method of dating old objects is not foolproof , it is the best method available at present
- People who do not sleep enough tend to become irritable .
- One of the greatest breakthroughs for professional women came in 1973 when the field of banking opened up for them.
- Solid geometry has enabled astronomers to calculate the positions of the heavenly bodies relative to one another.
- Cream of tartar 酒石 , a weak acid, can be added to egg whites to help them foam泡沫 when they are beaten
- 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.
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