在结构、认证和要求设备、传动装置、重量与平衡限制、起落架、发动机等等方面都有着许多的差异。
There are differences in structure, approved and required equipment, rigging, weight and balance limits, landing gear, engine, etc.
为了那一目标，NASA将花费数十亿美金打造新的发动机、推进器、生命维持系统等等。
To that end, NASA will spend billions of dollars developing new engines, propellants, life-support systems and the like.
汽车是一个很复杂的对象，由成千上万的其它对象组成，如发动机，车轮，方向盘，车座，车体等等其他不同的部分或部件。
It's an object, though a complex one, which consists of thousands of other objects such as the engine, wheels, steering, seats, body, and thousands of different parts and machinery.
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