rudders

A sailor uses the rudder to make the ship go in the correct direction.

水手用导航。

An oar often acts as rudder.

桨常可起用。

Turn the rudder slightly so that we can ease the boat round.

慢慢掌, 这样我们就能使船稳稳地拐过去。

II. Operational principles of airplane flying attitude: mainly reflected in the ailerons ,elevons and rudder operation system.

二、飞机飞行态操原理——主要反映在副翼、升降翼、方向操系统里。