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once upon a time : 1）むかしむかし
one at a time : 1）一つずつ
once in a while : 1）たまに、時たま
once for all : 1）きっぱりと
once and again : 1）幾度も
on urination : 1）排尿時に
once more : 1）もう一度
on ~ condition : 1）〜条件で
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once upon a time

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