They are also unique among flying insects because their fore wings partly overlap their hind wings.
它们的部分前翅是覆盖在后翅上的，这在能飞的昆虫中是独一无二的。
The groups with fore and hind wings both developed have no wing-coupling apparatus.
前后翅均发达，都是飞行器官的类群无连锁器。
Project Vahana is developing an electric-powered, vertical-takeoff-and-landing aircraft with multiple propellers mounted on fore and aft tilting wings.
项目正在开发一种电动能，能够使飞机垂直起降。飞机在它的前部和尾部都装有多个螺旋桨。
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