1
be deleterious to sth
deleterious 是正式用语，常与介词 to 搭配，表示“对……有害”。
Smoking is deleterious to your health.
吸烟对健康有害。
有害的；造成伤害的
先理解核心含义，再看它在真实句子里的用法。
有害的；造成伤害的
harmful to living things
Smoking is deleterious to your health.
吸烟对健康有害。
具有较低的适合度。
Having lower fitness.
The chemical spill had a deleterious effect on the local fish population.
化学品泄漏对当地鱼类种群产生了有害影响。
Smoking is deleterious to your health, so the doctor advised him to quit.
吸烟对你的健康有害，所以医生建议他戒烟。
The new policy proved deleterious for small businesses in the area.
新政策被证明对该地区的小企业有害。
deleterious 是正式用语，常与介词 to 搭配，表示“对……有害”。
Smoking is deleterious to your health.
吸烟对健康有害。
deleterious effect 是常见搭配，表示“有害影响”，后接 on 引出受影响的对象。
Stress can have a deleterious effect on the immune system.
压力会对免疫系统产生有害影响。
Not this
The deleterious of smoking are well known.
Use this
The deleterious effects of smoking are well known.
deleterious 是形容词，不能直接作名词。应在后面接一个名词（如 effects）来构成名词短语。
Not this
Smoking is deleterious for your health.
Use this
Smoking is deleterious to your health.
deleterious 表示“对……有害”时，固定搭配介词是 to，而不是 for。
Not this
This chemical can deleterious your health.
Use this
This chemical can be deleterious to your health.
deleterious 是形容词，不能作动词。要表达“对……有害”需用 be deleterious to 结构。
Focus on the distinctions below. Other candidates are kept compact until a reliable usage note is available.
有害影响；不良影响
Smoking has deleterious effects on your health.
吸烟对健康有不良影响。
有害后果
The management ignored the deleterious consequences of cutting safety training.
管理层忽视了削减安全培训带来的有害后果。
对健康有害
These chemicals are deleterious to human health.
这些化学物质对人体健康有害。
有害影响；负面冲击
Stress can have a deleterious impact on sleep quality.
压力会对睡眠质量产生有害影响。
有害突变
Natural selection removes deleterious mutations from a population.
自然选择会从种群中清除有害突变。
有害物质
The filter removes deleterious substances from drinking water.
过滤器能去除饮用水中的有害物质。
Use deleterious naturally, then get feedback on meaning, tone, grammar, and phrasing.
Revisit a common error or keep this word in your review list.
记住 deleTERIOUS 里有 delete（删除），有害的东西就该被删掉。
语域：formal 常见场景：学术写作、医学或科学文献、正式报告 deleterious 是正式用词，通常用于学术或专业语境，表示“有害的；造成伤害的”；日常口语中更常说 harmful 或 damaging。
True rhymes: mysterious, imperious, and serious share the stressed /ɪə/ + /riəs/ ending with deleterious. Lookalikes to watch: various has the -arious spelling but is pronounced /ˈvɛəriəs/, not /ˈɪəriəs/; delicious begins with deli- but is pronounced /dɪˈlɪʃəs/.
Dictionary facts from ECDICT, WIKTIONARY.