L&L：发射和着陆

“Launch and Landing”通常缩写为L&L，这种简写形式既便于快速记录，又利于日常使用。在美国国家航空航天局（NASA）等航天机构的相关文档和讨论中尤为常见。该术语的中文含义为“发射与着陆”，准确概括了航天任务中飞行器升空与返回的关键环节。

Impact deoeleration causing pain and injury in humans are often en-countered by astronauts during launch, reentry and landing.
航天员在宇宙飞行上升、返回和着陆过程中，都会受到冲击力的作用，冲击力会给人造成疼痛及损伤。
The dynamic researches in the phases of launch, flying in the orbit, during landing and after landing of the lander are presented.
阐明了着陆器在发射、在轨飞行、着陆和着陆后阶段的动力学研究内容。
Made up mostly of aerospace and software pros, the teams are allowed to use commercial rockets to launch their probes but must build the ships and steer them to a moon landing on their own.
这些小组大部分由空间科学和软件专家组成，他们可以使用商业火箭来发射探测器，但是必须自己制造飞船并且将其引导并降落到月球上。

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