Word · Frequency #4966
alert
警觉的；警惕的；注意的
Attentive, awake, and ready to notice danger or opportunities.
- 1.
Attentive; awake; on guard.
警觉的；清醒的；警惕的
警觉的；清醒的；警惕的；警觉的；灵敏的；留心的
In use
The guard remained alert throughout the night, watching for any unusual activity.
You need to be alert when driving in heavy rain.
A good student is always alert in class, ready to answer questions.
be alert to sth
alert to 后接需要警惕的对象。
Drivers should be alert to pedestrians crossing the road.
司机应该对过马路的行人保持警觉。
stay/remain alert
stay/remain alert 强调保持警觉状态，不接宾语。
Please stay alert while the experiment is running.
实验进行期间请保持警觉。
be alert for sth
alert for 后接可能出现的迹象或机会，与 alert to 侧重点略有不同。
Be alert for any signs of leaking gas.
要警惕任何漏气的迹象。
Common mistakes
She always alert in class.She is always alert in class.
中文里形容词可直接作谓语，但英语形容词作表语时必须加系动词be，所以应补上is。
You should be alert of phishing emails.You should be alert to phishing emails.
表示“对……警惕”时，alert后接介词to，不接of；of表示所属或来源，不能用来引出警觉的对象。
Connections
Collocations
- stay alert
- 保持警觉
- Please stay alert while driving at night.夜间开车时请保持警惕。
- be alert to
- 对…保持警觉
- Investors should be alert to market changes.投资者应对市场变化保持警觉。
- be alert for
- 警惕…
- Be alert for pickpockets in crowded areas.在拥挤的地方要警惕扒手。
- mentally alert
- 思维敏捷的
- Puzzles help keep you mentally alert.解谜有助于保持思维敏捷。
- fully alert
- 完全清醒的
- The noise made us fully alert.噪音使我们完全清醒。
Idioms & figurative uses
Learner notes
Memory Tip
alert 开头 a 像人竖起耳朵，听到风吹草动立刻清醒警觉。
Context & Register
语域：neutral 常见场景：安全提示、日常提醒、正式警告 作形容词时表示“警觉的、警惕的”，语气中性；通常用于 stay/be alert (for/to) 等搭配，在安全提示、日常提醒和正式警告中都比较常见。
Grammar Note
常与to连用，表示'对……警觉'；后接that从句。
Pronunciation & Spelling
These words rhyme with alert's stressed /ɝt/ ending: hurt, blurt, curt, assert, convert, dessert. Beware lookalikes such as alter and altar (both /ˈɔːltər/) and alley (/ˈæli/), which have similar spellings but sound completely different.
Usage priority
Collins 词频等级为 3，建议结合例句记忆，而不是只背中文释义。
Learn the forms together
页面下方列出了常见词形变化。学习时注意它们在句子中的语法位置。
Dictionary facts from DICTIONARY_API_DEV, ECDICT, WIKTIONARY, WORDNET.