a one-time + noun
用于可数名词前，表示‘曾经的’.
He is a one-time friend.
他曾经是我的朋友。
与过去特定时间段有关的,不延续到现在；以前的；仅发生或使用一次然后不再；古时的；一度的
指过去某个时间点的
与过去特定时间段有关的,不延续到现在
Of or pertaining to a specific period of time in the past, not extending to the present.
以前的
belonging to some prior time
仅发生或使用一次然后不再
Occurring or used in a single instance and then never again.
He is a one-time champion who now coaches young athletes.
他曾是冠军，现在指导年轻运动员。
用法提示："one-time" 修饰 "champion"，表示过去的身份。
The one-time factory building has been converted into a modern art gallery.
那座昔日的厂房已被改造成现代艺术画廊。
用法提示："one-time" 修饰 "factory building"，表示该建筑过去的用途。
She was a one-time colleague of mine before she moved to another city.
她曾是我的同事，后来搬到了另一个城市。
用法提示："one-time" 修饰 "colleague"，表示过去的关系。
用于可数名词前，表示‘曾经的’.
He is a one-time friend.
他曾经是我的朋友。
She was my one-time boss.
她曾是我的老板。
定冠词the表示特指.
The one-time champion has retired.
那位曾经的冠军已经退休了。
强调过去曾是，但现已不是。可互换，但former更常用于指人曾担任的职务。
强调顺序上的前一个，常用于列举或对比。可与one-time互换，但one-time更强调一次性或过去性。
强调时间上的过去，可修饰名词，但不如one-time精确指曾有一次。
较正式，常用于正式文件或语境，表示优先或在前。
grammar · medium
易错句子He was one-time a teacher.
正确表达He was once a teacher.
'one-time' 是形容词，不能用作副词；表示'曾经'时应使用副词 'once'。
grammar · medium
易错句子He is a one-time from that company.
正确表达He is a one-time employee from that company.
'one-time' 是形容词，需要修饰名词；不能单独作名词使用。
former 泛指任何‘以前的’（可指顺序或过去的职务），而 one-time 特指‘曾经一度担任’（强调过去的状态，通常不用于对比）
Choose the next layer that will help you use one-time with more confidence.
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