An introduction of a 16 channels electro-hydraulic servo control wave maker constructed in a ship model testing towing tunk.

介绍一个建于船模试验拖曳池中直推式16摇伺服控制造波机和波浪模拟方法及其计算机控制。

That part of a flight, in which the paraglider is not towed, carried or assisted by another aircraft or separate external or jettisonable power source.

飞行伞没有被拖曳，运载或经由另一个空器或独立外部或可抛弃式动力源协助，所作飞行部分。

Wedge-tailed Shearwater is a very lazy shearwater and tends to stay close to the surface of the water (apparently they trail their wing tips in the water).

长尾鸟是一种很懒惰鸟，倾向贴紧面飞行（他们翼尖很明显拖曳在面上）。