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| 21. | 5 Now, because of this precision, it is possible for planes to fly both ways down a 10-mile air corridor |
| 译文一：正由于这种准确度，现在飞机能在10英里宽的空中走廊内，分成两路各自降落，把航线容量扩大了一倍。 |
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| 22. | They fly up and down over the isle, sometimes describing circles in an unhurried manner, chirping or |
| 它们盘旋飞落，悠然自鸣，构成了一幅神奇美丽、生气勃勃的动画。 |
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