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| 51. | a population density of 50 per square kilometer |
| 每平方公里五十人的人口密度 |
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| 52. | The station is five kilometer from my house. |
| 车站离我家有五公里路。 |
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| 53. | Both were wounded during their145- kilometer inland detour. |
| 两只鲸鱼都在游进内陆的145公里过程中受伤。 |
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| 54. | No, it's not that tall, but it's2000 meters high at the foot. |
| 是不高，但是山脚的海拔高度就有两千米了。 |
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| 55. | of as little as one part in a trillion the equivalent of one teaspoonful in a lake that is 1 square kilometer |
| 有些物种可以发觉含量只有万亿分之一那么少的信息素并作出反应——相当于从面积为1平方千米、深l－2米的湖泊中取一茶匙水那么少。 |
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| 56. | The two towns are about five kilometer apart. |
| 两城相距五公里。 |
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| 57. | Their house is at an elevation of 2000 metres. |
| 他们的屋子位于海拔两千米的高处。 |
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| 58. | This liquid zone extends from a depth of 2,900 kilometers to a depth of 5,100 kilometers. |
| 这个流体带从2900千米深度延伸到5I00千米深度。 |
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| 59. | How many millimeters are there in a kilometer? |
| 一公里有多少毫米？ |
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| 60. | A metric unit of length equal to1, 000 meters(0.62 mile). |
| 千米，公里公制的长度单位，等于1，000米（0。62英里） |
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