一輩子：

1.WL(whole life)

2.ALT(a lifetime)

3.FALT(for a lifetime)

4.AOL(all one's life)

5.FL(for life)

6.IL(in life)

例句：

1.Don't give up. You still have your whole life in front of you.不要放棄，你的前面還有一輩子呢。

2.I was diagnosed with throat cancer, the result of a lifetime of smoking.我被診斷出患有喉癌，這是我一輩子吸菸導致的後果。

3.I've discovered the only genuine occupation for a life time.我找到了唯一真正可以做一輩子的職業。

4.You have been modelling yourself on others all your life.你一輩子都在以別人為榜樣。

5.He was scarred for life during a fight.他在一次打架中留下了一輩子的疤痕。

6.He has always felt that the dice were loaded against him in life.他總覺得自己一輩子都背運。

總結：life和a lifetime都可以表示“一輩子”，都表示時長，前面都可用介詞in 和for.

all life=a lifetime

一輩子是lifetime

英 ['laɪftaɪm]；美 ['laɪftaɪm]

n. 一生；終身；壽命；使用期限

1、lifetime的基本意思是“一生，生存期”，指人從出生到死亡的一段時間，也可指某物〔事物〕存在的整個時期。

2、lifetime在句子中有時也可以單獨使用，不需用介詞。

固定搭配：

1、during one's lifetime：在世期間

2、in sb's lifetime：在某人的一生中