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rust on [noun]
表示某处有锈迹时，介词用 on。
There is rust on the old gate.
旧大门上有铁锈。
锈；铁锈
先理解核心含义，再看它在真实句子里的用法。
锈；铁锈
the reddish-brown substance that forms on iron or steel when it reacts with moisture and oxygen; the damaged or corroded state caused by this
There is rust on the old gate.
旧大门上有铁锈。
铁或钢因湿气和氧化而劣化的状态,主要成分为三氧化二铁和氧化亚铁。
The deteriorated state of iron or steel as a result of moisture and oxidation; it consists mostly of iron(III) oxide (ferric oxide) and iron(II) oxide (ferrous oxide).
铁或钢因氧和湿气作用形成的红褐色氧化物涂层
a red or brown oxide coating on iron or steel caused by the action of oxygen and moisture
其他金属上形成的类似物质。
A similar substance based on another metal.
由多种锈菌引起的植物病害,导致叶片和茎部出现红褐色变色
a plant disease that produces a reddish-brown discoloration of leaves and stems; caused by various rust fungi
The old gate was covered in rust because it had been left out in the rain for years.
旧门上覆盖着铁锈，因为它在雨中暴露了好几年。
Farmers worry about rust on their wheat crops, as it can reduce the harvest.
农民担心小麦作物上的锈病，因为它会减少收成。
He used a wire brush to remove the rust from the metal table before painting it.
他在给金属桌上漆之前，用钢丝刷把铁锈刷掉。
表示某处有锈迹时，介词用 on。
There is rust on the old gate.
旧大门上有铁锈。
强调表面几乎完全被锈覆盖。
The abandoned car was covered with rust.
那辆废弃的汽车布满了铁锈。
from 后接名词 rust，表示防止生锈。
Applying paint protects the metal from rust.
涂漆能保护金属不生锈。
Not this
I saw a rust on the metal roof.
Use this
I saw rust on the metal roof.
rust（铁锈）在英语中是不可数名词，不能用不定冠词 a 修饰；汉语说“一层锈”并不表示可数。要表示“某处有锈”，直接用 rust 即可。
Not this
The old tools are covered with rusts.
Use this
The old tools are covered with rust.
rust 是不可数名词，没有复数形式；不要受汉语“斑斑锈迹”中的数量概念影响而加 -s。
Not this
The gate is rust.
Use this
The gate is rusty.
描述物体状态“生锈的”要用形容词 rusty，而不是名词 rust；rust 只表示“铁锈”这种物质，不能作表语形容状态。
Focus on the distinctions below. Other candidates are kept compact until a reliable usage note is available.
除锈剂
I applied rust remover to the old tools.
我在旧工具上涂了除锈剂。
铁锈渍
The rust stain on the bathtub is very stubborn.
浴缸上的铁锈渍非常顽固。
防锈
Regular painting is essential for rust prevention on outdoor railings.
定期涂漆对户外栏杆的防锈至关重要。
防锈的，抗锈的
These garden chairs are made of rust-resistant metal.
这些花园椅由防锈金属制成。
锈菌
The wheat crop was damaged by rust fungus.
小麦作物受到了锈菌的损害。
表面锈蚀
The car body has only surface rust, so it can be repaired easily.
这辆汽车的车身只有表面锈蚀，因此很容易修复。
锈迹斑斑的破旧车辆
He still drives that old rust bucket to work every day.
他每天还开着那辆锈迹斑斑的破旧车去上班。
铁锈地带（指传统工业衰落的地区）
Many factories in the Rust Belt have closed over the past decades.
在过去的几十年里，铁锈地带的许多工厂都关闭了。
锈蚀从不休眠（喻指松懈会导致衰败）
Remember, rust never sleeps—keep maintaining your skills.
记住，锈蚀从不休眠——要持续磨炼你的技能。
宁可累坏，不可锈坏。
The proverb 'Better to wear out than rust out' means it is better to stay active and eventually wear down than to sit idle and decay.
谚语‘宁可累坏，不可锈坏’的意思是：与其闲着腐朽，不如积极活动直到耗损。
锈蚀永不眠。
Neil Young named his 1979 live album Rust Never Sleeps, using the phrase to warn that neglect and decay are constant.
尼尔·杨将1979年的现场专辑命名为《Rust Never Sleeps》，用这句话警示人们忽视与衰败无时不在。
Use rust naturally, then get feedback on meaning, tone, grammar, and phrasing.
Revisit a common error or keep this word in your review list.
看到红褐色的铁锈就联想到 rust；想象一把生锈的旧铁锁，表面布满红褐色斑点，那就是 rust。
语域：neutral 常见场景：谈论铁器或钢材生锈、描写建筑或工具的锈蚀状况、农业或植物学语境中的锈病 该词在日常口语和书面语中都比较常见，没有强烈的语域限制；植物锈病这一义项多用于农业或植物学讨论中。
作为不可数名词指铁锈；作为可数名词指植物锈病
Dictionary facts from ECDICT, WIKTIONARY.