tooth decay
collocation蛀牙；龋齿
Brushing your teeth regularly can prevent tooth decay.
定期刷牙可以防止蛀牙。
腐烂
先理解核心含义，再看它在真实句子里的用法。
腐烂
The process or result of organic matter rotting, especially through microbial action.
The decay of the old wooden fence was accelerated by the constant rain.
旧木栅栏的腐烂因持续的雨水而加速。
腐烂；有机物逐渐分解的过程或结果,尤指微生物作用
Rot; any processes or result of organic matter being gradually decomposed, especially by microbial action.
逐渐变劣的过程
the process of gradually becoming inferior
状况恶化；地位、质量、力量或财富的丧失
Deterioration of condition; loss of status, quality, strength, or fortune.
逐渐减少；如存储电荷或电流的衰减
a gradual decrease; as of stored charge or current
Dentists recommend regular brushing to prevent tooth decay.
牙医建议定期刷牙以防止蛀牙。
The city's infrastructure has fallen into decay due to lack of maintenance.
由于缺乏维护，该市的基础设施已陷入衰败。
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蛀牙；龋齿
Brushing your teeth regularly can prevent tooth decay.
定期刷牙可以防止蛀牙。
城市衰败；城市衰退
The report blames urban decay on a lack of investment.
该报告将城市衰败归咎于缺乏投资。
道德败坏；道德沦丧
Many believe that social media has accelerated moral decay.
许多人认为社交媒体加速了道德败坏。
放射性衰变
Radioactive decay produces heat and radiation.
放射性衰变会产生热量和辐射。
破败状态；腐烂状态
The old factory is in an advanced state of decay.
这座旧工厂已处于严重破败的状态。
开始腐烂；衰败，荒废
The ancient castle fell into decay centuries ago.
那座古堡几个世纪前就已衰败。
城市衰败，都市衰落
The report highlights the problem of urban decay in many industrial cities.
该报告重点阐述了许多工业城市的城市衰败问题。
道德沦丧，道德败坏
Many people blame the media for the moral decay of society.
许多人指责媒体导致社会道德沦丧。
这是雪莱《奥西曼迭斯》中的名句，感叹权力与帝国终将衰亡。译文：除此之外，空无一物。在巨大残骸周围，荒漠无垠而空旷，孤寂平坦的沙地伸向远方。
The abandoned factory had fallen into decay over the years.
那座废弃的工厂多年来逐渐朽坏。
发长 /eɪ/ 音 (如 day, play)
Use decay naturally, then get feedback on meaning, tone, grammar, and phrasing.
Revisit a common error or keep this word in your review list.
联想：decay 里藏着 cay（小岛），海水日夜侵蚀小岛，使它逐渐腐烂崩塌——记住“腐烂、衰败、衰退”的意思。
语域：neutral 常见场景：日常对话：食物或植物变坏、腐烂、牙科/健康：蛀牙（tooth decay）、生物/环境科学：有机物分解 该义项为中性词，日常和书面语都可用。多用于描述有机物（如食物、植物、牙齿）因微生物等自然作用而分解、变坏的过程；在生物学或环境科学中也是标准用词。
作可数名词时通常指某一具体的衰退或腐烂实例。
Dictionary facts from ECDICT, WIKTIONARY, WORDNET.