Word
life-time
/laɪftaɪm/
noun
寿命；一生
the period of time during which something is alive or works
- 1.
the period during which something is functional (as between birth and death)
寿命；功能期
寿命；功能期；寿命
In use
The life-time of a butterfly is very short.
Regular exercise can increase your life-time.
The life-times of these ancient trees are measured in centuries.
in one's life-time
表示在某人一生期间。
She achieved great success in her life-time.
她一生中取得了巨大成功。
a life-time of + noun
表示持续一生的某事物。
He had a life-time of experience as a doctor.
他有作为医生一辈子的经验。
the life-time of + noun
表示某物的使用期限。
The life-time of a smartphone is about three years.
智能手机的寿命大约是三年。
Common mistakes
He received a life-time sentence.He received a life sentence.
“life-time”是名词，表示“寿命”；而“life sentence”是固定搭配，表示“无期徒刑”。用“life-time”替换“life”会导致语义错误。
I had a happy life-time.I had a happy life.
“life-time”指寿命或功能期限，用来描述生活经历不恰当；应用“life”表示生活。
Connections
Learner notes
Grammar Note
可数名词，常用于单数形式表示寿命或有效期。
Learn the forms together
页面下方列出了常见词形变化。学习时注意它们在句子中的语法位置。
Dictionary facts from ECDICT, WIKTIONARY, WORDNET.