fast asleep
idiom熟睡；酣睡
The baby was fast asleep in her crib.
婴儿在婴儿床里熟睡。
快速地；迅速地；很快地
fastest — superlative of fast
先理解核心含义，再看它在真实句子里的用法。
快速地；迅速地；很快地
Quickly; with great speed; in a short time.
She ran fast to catch the bus.
她跑得很快去赶公交车。
牢固地,稳固地；固定不动地；安全地。
In a firm or secure manner, securely; in such a way as not to be moved; safe, sound .
深沉地,酣畅地。
Deeply or soundly .
紧接着；非常接近。
Immediately following in place or time; close, very near .
快速地,迅速地；很快地。
Quickly, with great speed; within a short time .
The car was going too fast around the corner.
那辆车转弯时开得太快了。
He finished the test fast and then checked his answers.
他很快做完了测试，然后检查了答案。
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熟睡；酣睡
The baby was fast asleep in her crib.
婴儿在婴儿床里熟睡。
紧紧抓住；坚持
Hold fast to your dreams and don't let anyone discourage you.
坚持你的梦想，不要让任何人让你气馁。
反复无常；不负责任地对待
You can't play fast and loose with people's trust.
你不能把别人的信任当儿戏。
紧紧抓住梦想吧，因为梦想一旦破灭，生命就像一只折了翅膀的鸟，再也不能飞翔。
In Langston Hughes's poem 'Dreams', the repeated line 'Hold fast to dreams' urges readers to keep pursuing their goals.
在兰斯顿·休斯的诗歌《梦想》中，反复出现的诗句“紧紧抓住梦想”敦促读者坚持追求自己的目标。
活得快，死得年轻，然后留下一具好看的尸体。
This often-quoted line, from the 1949 film 'Knock on Any Door', celebrates a short life lived with reckless speed.
这句常被引用的台词出自1949年的电影《叩门》，赞美一种疯狂快速、短暂的人生。
Use fastest naturally, then get feedback on meaning, tone, grammar, and phrasing.
Revisit a common error or keep this word in your review list.
fast 有两个核心义：'快'和'牢'。联想：跑得快(fast)，抓得牢(fast)，睡得沉(fast asleep)。
语域：neutral 常见场景：日常对话、新闻报道、体育评论 表示“快速地”时，fast 是常见的中性用法，口语和书面语中都普遍使用；不过较正式的文体中有时会更倾向于用 quickly。
These words all rhyme with fast /fæst/ (American pronunciation; British /fɑːst/ for the whole group). The spelling chunk is -ast. Beware lookalikes like feast /fiːst/ and fist /fɪst/—they look similar but have different vowels and do not rhyme with fast.
Dictionary facts from DICTIONARY_API_DEV, ECDICT, WIKTIONARY, WORDNET.