rudder: [OE] Rudder comes from the same source as English row ‘use oars’ – prehistoric Germanic *rō- ‘steer’. Indeed it originally denoted an ‘oar used for steering’; the modern application to a fixed steering surface did not emerge until the 14th century. Its west Germanic ancestor *rōthra- also produced German ruder and Dutch roer. => row
rudder (n.)
mid-15c. alteration of Middle English rother, from Old English roðor "paddle, oar," from Proto-Germanic *rothru- (cognates: Old Frisian roðer, Middle Low German roder, Middle Dutch roeder, Dutch roer, Old High German ruodar, German Ruder "oar"), from *ro- "steer" (see row (v.)) + suffix -þra, used to form neutral names of tools.
Meaning "broad, flat piece of wood attached to the stern of a boat and guided by a tiller for use in steering" is from c. 1300. For shift of -th- to -d- compare burden (n.1), murder (n.); simultaneous but opposite to the movement that turned -d- to -th- in father (n.), etc.
实用例句
1. It was not yet clear how the rudder had sheared off.
还不清楚船舵是如何断裂的。
来自柯林斯例句
2. Turn the rudder slightly so that we can ease the boat round.
慢慢掌舵,这样我们就能使船稳稳地拐过去.
来自《简明英汉词典》
3. An oar often acts as rudder.
桨常可起舵的作用.
来自《简明英汉词典》
4. There is no rudder as such, so the craft can be steered only when under power.
没有真正的方向舵，所以只有在动力驱动的情况下才能操控船只。
来自柯林斯例句
5. A sailor uses the rudder to make the ship go in the correct direction.