The Pentagon is unable to explain images of what witnesses took to be a high-altitude rocket launched off the coast of southern California at sunset Monday, officials said.
有官员说，美国五角大楼无法解释星期一傍晚在加州南部出现的类似于高空发射火箭后产生的凝结尾流。
The low-pollution plane to carry between 50 and 100 passengers will take off using normal engines powered by biofuel made from seaweed before switching on its rocket engines at altitude.
该低污染的飞机可以搭载50到100名乘客，起飞时飞机使用从海藻中提炼的生物燃料驱动的常规引擎，当爬升到特定高度时，飞机会切换到火箭引擎。
During next week?s launch test, the flight is expected to last just over two minutes and reach an altitude of about 28 miles (45 km) as the Ares I-X rocket launches eastward over the Atlantic Ocean.
在下周的发射测试中，“战神I-X”将向东发射在大西洋上空，高度将达到约28英里（45公里），预计飞行时间将持续约两分多钟。
The market for launching small satellites is presently only partly served by the Pegasus rocket, which is launched at high altitude by a commercial jet aircraft.
在小型卫星的发射这一市场，目前只有天马火箭公司提供一些服务。他们用商务喷气式飞机在高空进行发射。
The rocket stages should separate at an altitude of about 130,000 feet (24.6 miles or 39 km) and continue upwards until they hit a maximum altitude of 150,000 feet (28 miles or 45 km).
火箭的两级将在海拔13万英尺（24.6英里或39千米）的高空分离并继续上升直到海拔15万英尺（28英里或45千米）。
The rocket stages should separate at an altitude of about 130, 000 feet (24.6 miles or 39 km) and continue upwards until they hit a maximum altitude of 150, 000 feet (28 miles or 45 km).
火箭的两级将在海拔13万英尺(24.6英里或39千米)的高空分离并继续上升直到海拔15万英尺(28英里或45千米)。
The spacecraft will launch on an ESA Vega rocket, reaching speeds of 16,000 miles per hour and 280 miles in altitude.
它将搭载欧盟织女（Vega）火箭升空，速度达到16000英里每小时，轨道高度280英里。
In this paper, a simple method for analysis of ground test data of the solid rocket motor with reversal nozzles is presented based on solving the reverse thrust at an altitude from ground test data.
文中介绍了根据地面实验数据分析反喷管在高空提供的反推力，为带反喷管发动机地面实验数据处理提供了简便的分析方法。
10 years later, in 1946, the first American-built rocket to leave the earth's atmosphere was launched from White Sands, attaining 50 miles of altitude.
10年后，的1946年，首枚美国制造的逃离地球大气层的火箭从白沙发射，达到了50英里的高度。
The tentative design of constant altitude flight solid rocket composed of the sustainer the booster and its simple control method is presented.
介绍了主发动机加助推器和简易控制方法实现固体火箭等高飞行的设计方案。
The tentative design of constant altitude flight solid rocket composed of the sustainer, the booster and its simple control method is presented.
介绍了主发动机加助推器和简易控制方法实现固体火箭等高飞行的设计方案。
The rocket can fly at constant speed and constant altitude.
火箭控制系统可保证其在某一高度上平飞。
Though designed during the 1950s, this rocket-powered research airplane set speed and altitude marks that were not sur-passed until the advent of the shuttle.
虽然它是在50年代设计的，但这种火箭动力飞机的研究标志着它的速度和高度直到航天飞机出现后才超过。
Though designed during the 1950s, this rocket-powered research airplane set speed and altitude marks that were not sur-passed until the advent of the shuttle.
虽然它是在50年代设计的，但这种火箭动力飞机的研究标志着它的速度和高度直到航天飞机出现后才超过。
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