1. Every year the United States is host to an average of 78,000 foreign high school level students, of which 3,000 are Brazilian.
    美国平均每年要接待78,000名中学学历程度的外国学生，其中3,000个来自巴西。

2. We finally stopped in front of a narrow street lined on either side with small one-level houses.
    我们终于在一条狭窄的、两边都排列着矮小平房的街道前面停了下来。

3. While active, child-bearing age women are most likely to have low iron stores, he notes, "Men are not safe, especially if they don't eat meat and have a high level of physical activity."
    他还指出，虽然积极锻炼的育龄妇女最有可能铁离子储量低，"但男性也并非不缺铁，尤其是在他们不吃肉类而又从事高强度的体力活动的情况下。"

4. The city at one time must have been prosperous, for It enjoyed a high level of civilization.
    这座古城在一个时期准是很繁荣的,因为它曾享有高度文明.

5. The cellar is below road level.
    地窖在路面以下。

6. The city at one time must have been prosperous, for It enjoyed a high level of civilization.
    这座古城在一个时期准是很繁荣的,因为它曾享有高度文明.

7. The tunnel would be well- ventilated if tall chimneys were built above sea-level.
    假如高大的烟囱状通风管伸出海面的话，这条隧道的通风将是良好的。

8. The city at one time must have been prosperous, for it enjoyed a high level of civilization.
    这座古城肯定一度很繁荣，因为它曾享有高度的文明，

9. The tunnel would be well-ventilated if tall chimneys were built above sea level.
    如果再建些伸出海面的高大的烟囱状通风管，隧道就具备了良好的通风条件。

10. The crossing voyage of about 5000 miles took two months, three weeks and two days.
    大约5000多英里的航程花了两个月三星期零两天的时间。