It's a long story.
((略式))それを話すと長くなるから（やめておく）
It's a matter of degree.
程度問題だ
It's a mercy that ....
((略式))…とはありがたい
It's a mere assumption.
単なる仮定の話だ
It's a mile, more or less, from his home to the school.
彼の家から学校まで１マイルかそこらだ
It's a miracle that he wasn't killed.
彼が死ななかったのは奇跡だ
It's a real treat for me to stay in bed late.
朝寝坊に勝るものはない
It's a sin to waste time.
時間を浪費するなんてけしからん
It's a snap.
ちょろいもんさ
It's a splendid idea.
それはすばらしい考えだ
