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1.slide down 往下滑
These kids will slide down from the middle.
而这些孩子将从山腰间滑落。
2.resistance 阻力
The design of the bicycle reduces the effects of wind resistance and drag.
这种自行车的设计减少了风阻及曳力的影响。
3.mechanical 机械的
This is the oldest working mechanical clock in the world.
这是世界上最古老的还可以使用的机械钟。
4.They used the ideas they had developed from their earlier experiments with the toy helicopter, kites, printing machine and bicycles.
develop from 从...发展而来
Most plants develop from seeds.
多数植物都是由种了长成的。
5.This glider proved that they had solved most of the problems of balance in flight.
prove 证明
The results prove that regulation of the salmon farming industry is inadequate.
结果证明，大马哈鱼养殖业的管理是失当的。
6.He gave demonstration flights at heights of ninety meters.
demonstration flights 示范飞行
The time and venue for the demonstration flight and other details will be disclosed at a later time.
试飞时间、地点等其它细节将在晚些时候公布。
