问题标题：
为什么选"aday",为什么不选"perday"or"everyday"?原题"Beatingseventytimesaminute,theheartpumpstwothousandgallonsofbloodadayandfifty-fivemilliongallonsinalifetime."
问题描述：
为什么选"aday",为什么不选"perday"or"everyday"?
原题
"Beatingseventytimesaminute,theheartpumpstwothousandgallonsofbloodadayandfifty-fivemilliongallonsinalifetime."
涂仁发回答：
Surelyyoucanusethewords"perday,oreveryday".Buthereforsymmetricreasons,asituses"aminute","alifetime"already.Sotomatchit,"aday"soundsmuchbetter.
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