fast asleep
idiom熟睡着的；睡得很沉的
After the long drive, the children were fast asleep in the back seat.
长途开车后，孩子们在后座睡得很沉。
禁食；斋戒
fasted — past of fast
先理解核心含义，再看它在真实句子里的用法。
禁食；斋戒
To eat no food for a period of time, especially for religious or medical reasons.
She has fasted for three days.
她已经禁食三天了。
因宗教原因禁食,尤指不吃食物。
To practice religious abstinence, especially from food.
因医疗或健康原因限制营养摄入,节食。
To reduce or limit one's nutrition intake for medical or health reasons, to diet.
因宗教或医疗原因禁食某些食物
abstain from certain foods, as for religious or medical reasons
使(人或动物)禁食,尤指停止进食。
To cause (a person or animal) to abstain, especially from eating.
fast
Base
原形
fasts
3rd person
第三人称单数
fasting
-ing
现在分词
fasted
Past
过去式
fasted
Past participle
过去分词
Many people fast during Ramadan.
许多人在斋月期间禁食。
She fasted for three days before the medical test.
她在体检前禁食了三天。
He has fasted for religious reasons once a week.
他因宗教原因每周禁食一次。
规则动词，意为因宗教或健康原因禁食。
Many people are fasting during Ramadan.
许多人在斋月期间禁食。
AI contextual example
He fasts every Monday for health reasons.
他为了健康原因每周一禁食。
AI contextual example
Catholics sometimes fast during Lent
天主教徒有时在四旬期禁食。
WordNet
Before the medical exam, you must fast
体检前必须禁食。
WordNet
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熟睡着的；睡得很沉的
After the long drive, the children were fast asleep in the back seat.
长途开车后，孩子们在后座睡得很沉。
反复无常；不负责任地随意对待
You can't play fast and loose with the safety rules.
你不能拿安全规定当儿戏。
（规则、规定等）固定不变的，不容更改的
There are no hard and fast rules for making friends.
交朋友没有什么一成不变的规则。
你们禁食的时候，不可像那假冒为善的人，脸上带着愁容；因为他们把脸弄得难看，故意叫人看出他们是禁食。
Many people fast during Ramadan.
许多人在斋月期间禁食。
Use fasted naturally, then get feedback on meaning, tone, grammar, and phrasing.
Revisit a common error or keep this word in your review list.
把 fast 想成‘快’：斋戒禁食时，日子过得快，就能记住动词 fast 是‘禁食’。
语域：mixed 常见场景：religious observance、medical/health dieting、causing someone or an animal to fast 该动词在宗教斋戒、医疗或健康节食等语境中较为常见，语气通常为中性偏正式；日常口语中更常说 not eat 或 go without food。具体使用场景不同，语气也随之变化。
不接宾语
Dictionary facts from DICTIONARY_API_DEV, ECDICT, WIKTIONARY, WORDNET.