from day one
<abbr style="text-decoration: underline;" title="from / since" >from</abbr>
frɒm
from
day
deɪ
dei
one
wʌn
van

英語での「from day one」の定義と意味

from day one
01

since the earliest stage or point in time 

例
The project was doomed from day one. 
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