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once in a while : 1）たまに、時たま
one at a time : 1）一つずつ
once upon a time : 1）むかしむかし
on the whole : 1）おしなべて、一般的に(言って)
once a week : 1）週に一度
once and again : 1）幾度も
one inch : 1）1インチ
once again : 1）もう一度
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once in a while

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