by accident or by design
偶然なのか計画的なのか．
by air [sea, land]
空［海，陸］路で
by air [surface, sea] mail
航空［普通，船］便で
by [via] air mail
航空便で
by airplane
飛行機で
by ambulance
救急車で
by an irony [a twist] of fate
運命の皮肉［いたずら］で
by an unhappy coincidence
運悪く
by analogy with ... ＝on the analogy of ...
…から類推して
By and large this is a correct assessment.
概してこれは正しい評価だ
