adj.快的；迅速的；紧的；牢固的；放荡的
adv.快速地；紧紧地；放荡地；深深地
n.斋戒；禁食；系泊用具
v.斋戒；禁食
I like fast music. 我喜欢节奏快的音乐。
The star was whipped into a fast car and driven off. 那个明星迅速上了一辆汽车疾驶而去。
The post is fast in the ground. 那柱子牢牢地埋在地里.
He led a fast life. 他过着放荡的生活。
用作副词 (adv.)He ran fast enough to catch the thief. 他跑得飞快，足以抓住那小偷。
Bind the rope fast lest it should come loose. 把绳子绑牢，免得它松脱。
He is living too fast for his health. 他现在的生活过于放荡，于健康不利。
The boat was stuck fast in the mud. 那船深深地陷在泥里.
用作名词 (n.)The priest had only water and bread during his three week fast. 牧师在三个星期的斋戒期间只进食水和面包。
So the meal that breaks your fast should be healthy and wholesome. 因此解除禁食的这一餐应该是健康有益的。
用作动词 (v.)They have to fast from dawn to dusk. 他们一整天都得禁食。
Before the medical exam, you must fast. 在体检之前，你必须禁食。
fast的基本意思是“快的”,通常指运动的人或物体本身有快速的特点。引申指“牢固的”,此时只用作表语。还可指“(颜色)不褪色的”。
fast可以表示钟表时间的快,但要放在时间名词之后,而不能按汉语的表达习惯放在前面。
adv.(副词)fast用作副词时,可指物体或人的速度快,主要用来修饰人或物体的动作。也可指某物“牢固地”。
fast可与介词连用,如by, in等。
