Twin rudders provided the steering , along with centerboards and two oars .

一对船舵负责掌握方向，还有活动船板和2个船桨。

This innovation finally enabled european torpedo boats to use their rudders while traveling at high speed ( about 30 knots ) .

后来这一创新使欧洲鱼雷艇可以在高速（约30海里）航行的情况下还得以使用船舵。

A country of 1.6 billion people that is now one of the only rudders working in the global economy is too big to fail .

1.6亿人，现已在全球经济中工作的只有一个国家是船舵太大而不能倒闭。

Rudders and engine-driven propellers moved zeppelins through the air , much as they propel a ship through the seas , with the fastest of them traveling at speeds of up to 90 mph .

方向舵和发动机驱动的螺旋桨使飞艇在空气中移动，很像他们驱使一艘船在海中航行，最快速度高达90英里每小时。

New research suggests that the giant birds use their wings as " air rudders " to rapidly change directions while running and to stop quickly .

新的研究表明巨型鸟类在快速跑或急停时使用翅膀作为“空气舵”以迅速改变方向。