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航空航天翻译示例
原文
The Robot Explorers
The landing sequence is started by the radio altimeter mounted in the spacecraft which, by ranging its signal against the surface of the moon, receives the echo. At 70,200 ft and 8.1 sec before the spacecraft is due to crash and destroy itself, the delay time between the radar pulse and echo is such that the altimeter will generate a fusing signal which starts the lunar capsule separation sequence.
As it begins, the spacecraft power supply will explode four bolt cutters on the clamp that holds the retro-rocket and the lunar capsule to the spacecraft. The clamp will fly out. Simultaneously, the same power supply will blow a squib which activates a battery and sequencer in a small container located between the retro-rocket and the lunar capsule. From this point, all events governing the operation of the capsule and its braking motor will be controlled from the sequencer.
When the squib switch is closed, the sequencer energizes three timers. The first timer, with a built-in delay of 135 microseconds, ignites the small spin motor in the nozzle of the retro-rocket. This delay is programmed so that the clamp which holds the assembly to the spacecraft has time to fly free before the capsule starts to spin.
The spin motor, which produces a thrust of some 20 lb, has three nozzles tilted down at an angle of 10. Thus, when it ignites and spins the retro-rocket and lunar capsule assembly at 300 rev/min, the angled thrust results in the entire assembly lifting approximately 2.5 ft above its cradled position in the spacecraft. Then the retro-rocket itself fires; and as it does so it ejects the spin motor from the nozzle.
Separation of the capsule assembly disturbs the attitude of the spacecraft to such an extent that the directional antenna will lose its lock on the earth, resulting in loss of TV pictures at earth. The parent vehicle goes on to crash to destruction.
译文
无人探测器
着陆程序由探测器上安装的无线电高度表启动，该高度表通过向月球表面发射信号并接收反射波来测距。通过对雷达脉冲和回波不断的测算，在 70,200 英尺的高度、距探测器坠毁还有 8.1 秒时，高度表发出引信信号启动着陆舱分离程序。
分离程序启动后，探测器的电源系统引爆四个爆炸螺栓，切断将制动发动机和着陆舱固定到探测器上的夹紧装置。与此同时，电源系统通过导火管开关激活位于制动火箭与着陆舱之间的一个小舱室内的电池和程序控制器。从这时起，着陆舱和制动火箭的所有动作都由该程序控制器控制。
导火管开关闭合后，程序控制器会激活三个定时器。第一个定时器设定了 135 毫秒的延时，用来启动制动火箭喷管上的小型起旋发动机。通过设定延时，当着陆舱组合体与探测器之间的夹紧装置张开后着陆舱才开始起旋。
起旋发动机有三个倾角为 10 度的喷管，能产生大约 20 磅的推力。起旋发动机启动后，使制动火箭和着陆舱组合体以 300 转/分钟的速度旋转，并在侧向推力的作用下将组合体推离探测器母船大约 2.5 英尺。随后制动火箭开始点火，同时将起旋发动机从喷管中推出。
着陆舱组合体的分离动作会影响探测器的姿态，甚至可能使定向天线失去对地球的锁定，导致地面接收不到电视图像。分离后的探测器母船继续下落直至撞毁。
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