Usually they burn up about 100km above the earth . 它们常在地球上空约100公里处被烧毁。
On a bright and clear day a 15-cm helio can be seen at 50 km . 在明朗的晴天，15厘米大小的回照光在50公里处能看到。
Depths of these hypocenters concentrate at about 12km deep in the upper crust . 这些震源深度集中在地壳上部约12公里处。
The lower boundary of the region above which molecular diffusion dominates is 120 km altitude and is known as the turbopause . 分子扩散占主导地位的区域下界约在120公里处称为湍流层顶。
The airport is a few kilometers to the south of london 机场在伦敦南方数公里处。
No . 1300 qili dianchi road guandu region kunming 昆明市官渡区滇池路七公里处1300号
Raul : it ' s about 50 kilometres north of the city 劳尔：城市以北约五十公里处。
Cheshunt is a few kilometers to the north of london 切森特位于伦敦北方数公里处。
Tianjin is situated l20 km southeast of beijing 天津位于北京东南120公里处。
Tianjin is situated 120 km southeast of beijing 天津位于北京东南120公里处。
