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rubber + noun
rubber 作不可数名词，意为“橡胶”。
The tires are made of rubber.
这些轮胎是橡胶制成的。
橡胶
rubbers — plural of rubber
先理解核心含义，再看它在真实句子里的用法。
橡胶
rubber (elastic material)
The tires are made of rubber.
这些轮胎是橡胶制成的。
可指天然橡胶或合成橡胶。
从橡胶树汁液中提取的柔韧材料；异戊二烯的碳氢化合物生物聚合物
Pliable material derived from the sap of the rubber tree; a hydrocarbon biopolymer of isoprene.
在两名竞争者之间的一系列比赛中,整体获胜者是赢得大多数单场比赛的竞争者
In relation to a series of games or matches between two competitors where the overall winner of the series is the competitor which wins a majority of the individual games or matches:
从树木(尤其是橡胶树和榕树)的乳胶中获得的弹性材料,可硫化并制成各种产品
an elastic material obtained from the latex sap of trees (especially trees of the genera Hevea and Ficus) that can be vulcanized and finished into a variety of products
天然橡胶或具有类似于天然橡胶性质的各种合成材料
Natural rubber or any of various synthetic materials with similar properties as natural rubber.
I need a rubber to erase this pencil mark.
我需要一块橡皮擦掉这个铅笔印记。
The tires are made of rubber.
这些轮胎是由橡胶制成的。
Many shoe soles are made from synthetic rubber.
许多鞋底是由合成橡胶制成的。
rubber 作不可数名词，意为“橡胶”。
The tires are made of rubber.
这些轮胎是橡胶制成的。
rubber 作可数名词，在英国英语中常指橡皮擦。
Can I borrow your rubber?
我可以借你的橡皮擦吗？
rubber 在此意为“决胜盘”，常用于体育比赛。
The team won the rubber match.
该队赢得了决胜局。
Not this
The tire is made of a rubber.
Use this
The tire is made of rubber.
当 rubber 表示'橡胶'这一材料时，它是不可数名词，不能加不定冠词 a。
Not this
Please rubber the board clean.
Use this
Please rub the board clean.
表示'擦'的动作应使用动词 rub，而不是名词 rubber。
Focus on the distinctions below. Other candidates are kept compact until a reliable usage note is available.
橡皮筋
She stretched the rubber band around the envelope.
她把橡皮筋套在信封上。
橡胶手套
Wear rubber gloves when handling chemicals.
处理化学品时戴上橡胶手套。
橡皮图章
The office uses a rubber stamp for incoming mail.
办公室用橡皮图章盖收到的邮件。
橡胶鞋底
These boots have a thick rubber sole.
这双靴子有厚厚的橡胶鞋底。
天然橡胶
Tires are often made from natural rubber.
轮胎通常由天然橡胶制成。
合成橡胶
Synthetic rubber is used in many industrial products.
合成橡胶用于许多工业产品。
关键时刻；实践阶段
The plan looks good on paper, but let's see where the rubber meets the road.
这个计划在纸面上看起来不错，但让我们看看实际执行时的情况。
橡皮图章；不经审查就批准的人或机构
The committee is just a rubber stamp for the CEO's decisions.
委员会只是首席执行官决策的橡皮图章。
空头支票
He paid with a rubber check, and the bank charged him a fee.
他用空头支票付款，银行向他收取了费用。
橡皮小鸭，你就是那个（儿歌歌词）
Ernie sings about his rubber duckie in the bath.
厄尼在浴缸里唱着他的橡皮小鸭。
Use rubbers naturally, then get feedback on meaning, tone, grammar, and phrasing.
Revisit a common error or keep this word in your review list.
Rubber 音似“擦布”，橡皮擦就是用来擦的，rub 即“擦”。
通常在科技或工业语境中指弹性材料；在英式英语中也常指橡皮擦。register为中性，但需注意义项区别。
不可数与可数：作为材料不可数，作为橡皮擦可数
Dictionary facts from DICTIONARY_API_DEV, ECDICT, WIKTIONARY, WORDNET.