快的；走得快；感光快的；紧的
adv.（比准确的时间或宣布的时间）快；迅速地；紧紧地；彻底地
vi.禁食，（尤指）斋戒；
n.禁食期，斋戒期；断食，节食；
过去式：fasted过去分词：fasted现在分词：fasting第三人称单数：fasts
同义词：fasting
v.abstain from certain foods, as for religious or medical reasons"Catholics sometimes fast during Lent"
abstain from eating"Before the medical exam, you must fast"
adj.acting or moving or capable of acting or moving quickly"fast film"; "on the fast track in school"; "set a fast pace"; "a fast car"
(used of timepieces) indicating a time ahead of or later than the correct time"my watch is fast"
at a rapid tempo"the band played a fast fox trot"
(of surfaces) conducive to rapid speeds"a fast road"; "grass courts are faster than clay"
firmly fastened or secured against opening"windows and doors were all fast"
同义词：barredboltedlatchedlockedsecured
resistant to destruction or fading"fast colors"
unrestrained by convention or morality"fast women"
同义词：debaucheddegeneratedegradeddissipateddissolutelibertineprofligateriotous
hurried and brief"a fast visit"
同义词：flyingquick
securely fixed in place同义词：firmimmobile
unwavering in devotion to friend or vow or cause"fast friends"
同义词：firmloyaltruehearted
adv.quickly or rapidly (often used as a combining form)"how fast can he get here?"; "ran as fast as he could"; "needs medical help fast"; "fast-running rivers"; "fast-breaking news"; "fast-opening (or fast-closing) shutters"
firmly or tightly"held fast to the rope"; "her foot was stuck fast"
同义词：tight
fast food速食，快餐
as fast as和…一样快
fast growth快速生长
fast response快速响应
fast algorithm快速算法
fast fourier transform快速傅里叶变换
hold fast v. 紧紧抓住
stand fast不让步；不后退
fast moving adj. 快速移动的
fast track快速立法；快速通道
fast and furious飞快地
fast food restaurant速食店
fast asleep熟睡的；很快地入睡
fast lane快车道
hard and fast严格的；固定不变的
fast ethernet快速以太网
fast reaction快速反应；快速核反应
fast time 夏令时间；日光节约时间（daylight-saving time）
fast dry快干
fast train快车
更多收起词组短语hasty多指匆忙、草率或仓促的行动，着重缺乏深思熟虑。
quick特指瞬时动作，强调动作敏捷迅速；也指匆忙的行为，而不暗示速度很快。
prompt主要指动作迅速，毫不拖延，含“快得令人愉悦”的意味。
fast常指人或物持续地高速运动，强调运动的方式。
instant指某事很快发生或急待解决，含刻不容缓之意。
rapid比fast和quick正式，常指运动本身，侧重速度惊人。所指动作可能是短暂的，也可能是持续的。
speedy指人或物或其运动、活动时，着重极度的快捷，多含匆忙意味。
swift正式用词，强调非常迅速，往往含动作轻快敏捷之意。
fast, quicklyfast 侧重于指人或物体具有运动速度快的特点, run fast,
quickly 侧重指某事完成或发生的快 answer the question quickly