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be hazardous to sth/sb
Smoking is hazardous to health.
吸烟对健康有害。
危险的, 冒险的
先理解核心含义，再看它在真实句子里的用法。
危险的, 冒险的
involving risk or danger
Smoking is hazardous to health.
吸烟对健康有害。
有风险的；危险的；具有危险性质的
Risky; dangerous; with the nature of a hazard.
The workers were warned about the hazardous chemicals in the factory.
工人们被警告工厂里有危险的化学品。
Driving in heavy rain can be hazardous due to poor visibility.
在大雨中开车可能因能见度低而危险。
It is hazardous to walk on the icy sidewalk without proper footwear.
在没有合适鞋子的情况下走在结冰的人行道上很危险。
Smoking is hazardous to health.
吸烟对健康有害。
It is hazardous for children to play near the road.
孩子们在路边玩耍很危险。
Many drivers find icy roads hazardous.
许多司机认为结冰的路面很危险。
Not this
This chemical is hazardous for your health.
Use this
This chemical is hazardous to your health.
介词搭配错误：表示'对……有危害'时，hazardous后应接介词to，而不是for。这是因为hazardous to是固定搭配，强调危害的对象。
Not this
The hazardous of smoking are well-known.
Use this
The hazards of smoking are well-known.
词性混淆错误：hazardous是形容词，不能作名词使用；表达'危险'时需用其名词形式hazard。这里应使用复数名词hazards作主语。
Focus on the distinctions below. Other candidates are kept compact until a reliable usage note is available.
危险废物
The company was fined for improper disposal of hazardous waste.
该公司因不当处理危险废物而被罚款。
危险材料
Workers must be trained to handle hazardous materials safely.
工人必须接受安全处理危险材料的培训。
危险状况
The road is closed due to hazardous conditions.
由于危险状况，道路封闭。
危险任务
Soldiers receive extra pay for hazardous duty.
士兵因执行危险任务而获得额外津贴。
危险化学品
The spill of hazardous chemicals caused an evacuation.
危险化学品的泄漏导致了疏散。
危险旅程
Their hazardous journey across the desert took two weeks.
他们穿越沙漠的危险旅程耗时两周。
危险任务
The soldiers were awarded medals for their hazardous duty in the war zone.
士兵们因在战区执行危险任务而获得勋章。
危险废物
The factory was fined for illegally dumping hazardous waste into the river.
该工厂因非法向河流倾倒危险废物而被罚款。
危险物质
Workers must wear protective gear when handling hazardous materials.
工人在处理危险物质时必须穿戴防护装备。
Use hazardous naturally, then get feedback on meaning, tone, grammar, and phrasing.
Revisit a common error or keep this word in your review list.
hazard（危险）加上ous，意为充满危险的，即危险的。
该词比较常见于正式或专业语境，如安全警告、科学描述等，在日常口语中较少使用。
All listed words end in -ous but do not rhyme with /ˈhæz.ər.dəs/. The stressed vowel and stress patterns differ; hazardous has /æ/ and first-syllable stress, while others have various vowels and some have second-syllable or different stress.
Dictionary facts from ECDICT, WIKTIONARY.