英语短语解释区别for a timeon a timeat a tim

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英语短语解释区别
for a time
on a time
at a time
PS:我不确定其中的短语是否真有

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  • for a time 有一段时间,一度
    如for a time ,he had everyone`s attention .他一度得到所有人的注意.
    on a time 从前,副词
    Think back on a time when you did this .回想以前你这么做的时候.
    at a time 每次
    He tossed the peanuts into his mouth one at a time.
    他每次将一粒花生扔进嘴里.