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 .
