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。
寿命；一生
寿命；功能期
the period of time during which something is alive or works
寿命；功能期
the period during which something is functional (as between birth and death)
The life-time of a butterfly is very short.
蝴蝶的寿命非常短。
用法提示：life-time 在此句中用作名词，表示‘寿命’，即从出生到死亡的时间。
Regular exercise can increase your life-time.
定期锻炼可以延长你的寿命。
用法提示：life-time 用作名词，指人的寿命长度。
The life-times of these ancient trees are measured in centuries.
这些古树的寿命以世纪计算。
用法提示：life-times 是 life-time 的复数形式，同样表示‘寿命’。
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。
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。
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。
grammar · medium
易错句子He received a life-time sentence.
正确表达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。
grammar · medium
易错句子I had a happy life-time.
正确表达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。
指生物从出生到死亡的时间长度，强调自然期限；而life-time多用于医学语境，指器官或系统功能期限。
强调活得长的性质或状态，带正面色彩；life-time则指客观存在的生命期限，不强调长短。
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