So these are things like aviation services and systems and commercial and military engines.
所以这些就是航空服务和系统以及商业和军用发动机。
Military engine
原声例句
How BIG 科普扫盲（第一季）
How BIG 科普扫盲（第二季）
His plan was to start installing surplus military engines onto traditional bicycles, creating a kind of hybrid.
他的计划是开始将多余的军用发动机安装到传统自行车上，创造出一种混合动力车。
经济学人 Science and technology
This virtual " fly-off" , potentially worth $2.6bn, was won by Rolls-Royce, a British engineering group, using a digital twin that replicated its F130 military engines installed in a B-52.
此次虚拟“飞行比赛” 的潜在价值可能达到 26 亿美元，获胜者是英国工程集团劳斯莱斯，他们使用数字孪生技术复制了安装在 B-52 上的 F130 军用发动机。
英语百科
Siege engine
（重定向自Military engine）
A siege engine is a device that is designed to break or circumvent city walls and other fortifications in siege warfare. Some have been operated close to the fortifications, while others have been used to attack from a distance. From antiquity, siege engines were constructed largely of wood and tended to use mechanical advantage to fling stones and similar missiles. With the development of gunpowder and improved metallurgical techniques, siege engines became artillery. Collectively, siege engines or artillery together with the necessary troops and transport vehicles to conduct a siege are referred to as a siege-train.
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