プログレッシブ和英中辞典(第4版)の解説
すうじつ【数日】
several days
彼に数日（間）会っていない
I haven't seen him 「for several days [(for) the last few days].
数日前，雪が降った
It snowed several days ago.
数日後にまた来てください
Come again after a few days.
数日間高熱が続いている
She has had a high temperature for the past few days.