the vane shows/indicates [direction]
The vane on the roof shows the wind direction.
屋顶上的风向标指示风向。
风向标；风标
叶片；轮叶；尾翼；定向翼；羽片；羽瓣；照准器；瞄准标
a weather vane, a device that shows the direction of the wind
风向标。
A weather vane.
风向标
mechanical device attached to an elevated structure; rotates freely to show the direction of the wind
沿轴径向安装的若干通常较薄、坚硬、扁平或有时弯曲的表面的任何一种,如涡轮机叶片或风车帆,由流体转动或用于转动流体。
Any of several usually relatively thin, rigid, flat, or sometimes curved surfaces radially mounted along an axis, as a blade in a turbine or a sail on a windmill, that is turned by or used to turn a fluid.
尾翼
a fin attached to the tail of an arrow, bomb or missile in order to stabilize or guide it
羽毛的扁平、网状部分,由羽轴两侧的一系列羽枝组成。
The flattened, web-like part of a feather, consisting of a series of barbs on either side of the shaft.
叶片
flat surface that rotates and pushes against air or water
六分仪或罗盘上的瞄准器。
A sight on a sextant or compass.
炸弹或其他导弹尾部的金属导向或稳定翼片。
One of the metal guidance or stabilizing fins attached to the tail of a bomb or other missile.
The farmer looked up at the weather vane on the barn to see which way the wind was blowing.
农夫抬头看着谷仓上的风向标，想看看风往哪个方向吹。
用法提示：vane 此处为名词，指测量风向的风向标。
Before the trip, we checked the wind vane at the harbor to decide whether to sail.
出发前，我们查看了港口的风向标，决定是否出海航行。
用法提示：vane 作名词，构成 wind vane，表示用于判断风向的装置。
The museum guide explained that this ancient vane was used by sailors centuries ago.
博物馆讲解员说，这座古老的风向标是几个世纪前水手使用的。
用法提示：vane 是名词，指作为风向标使用的物体。
The vane on the roof shows the wind direction.
屋顶上的风向标指示风向。
这里 vane 指机器里转动的叶片。
The vanes in the turbine are made of metal.
涡轮机中的叶片是金属制成的。
这个义项常用于描述羽毛结构。
The vane of a feather is made up of tiny barbs.
羽毛的羽瓣由细小的羽枝构成。
在涡轮机、风扇等旋转机械中，vane 与 blade 常可互换；但 blade 更通用，还可指刀具等锋利薄片，而 vane 专指导流或导向用的扁平表面。
sail 主要用于传统风车，指由木框和帆布组成的翼板；vane 也可指风车上的此类翼板，但更常用于涡轮机等现代机械的叶片。两者并非在船帆等语境中可互换。
grammar · medium
易错句子The weather vain shows the wind direction.
正确表达The weather vane shows the wind direction.
vain 意为“徒劳的、虚荣的”，与 vane 同音但不同义；表示“风向标”必须拼作 vane。
grammar · medium
易错句子The turbine has several vane.
正确表达The turbine has several vanes.
vane 是可数名词，复数形式为 vanes；汉语中没有复数变化，因此容易漏掉词尾 -s。
与 vane 同音，但 vain 是形容词，表示“虚荣的、自负的”或“徒劳的”，而 vane 是名词，指“风向标”或“叶片”。注意词性区别。
与 vane 同音，但 vein 是名词，多指“静脉、叶脉”等，vane 则指“风向标、叶片”。拼写和含义不同。
风向标
The weather vane on the barn pointed north.
谷仓上的风向标指向北方。
涡轮叶片
The turbine vane was damaged by overheating.
涡轮叶片因过热而损坏。
导向叶片；导流叶片
Guide vanes direct the airflow in the engine.
导向叶片引导发动机中的气流。
叶片泵
A vane pump is used in the hydraulic system.
液压系统中使用了叶片泵。
尾部稳定翼；尾翼
The missile's tail vanes stabilize its flight.
导弹的尾翼使其飞行稳定。
weather + vane
vane + -ed
guide + vane
vane + pump
风向标用来指示风的方向。
风向标的主要用途是显示风向。
风向标通常安装在屋顶等高处。
风向标属于气象观测设备。
vane也可指涡轮机中的叶片。
像风向标一样反复无常，见风使舵
His opinions are as changeable as a weather vane, so don't rely on his promise.
他的看法像风向标一样反复无常，所以别指望他的承诺。
……的风向标，……的晴雨表
Retail sales are often a weather vane for consumer confidence.
零售额往往是消费者信心的一个风向标。
像风向标一样摇摆不定，随波逐流
He turns like a weather vane in every debate, agreeing with whoever spoke last.
每次辩论他都像风向标一样转来转去，谁最后发言他就同意谁。
Dictionary facts from ECDICT, WIKTIONARY.