by blind chance
まったく偶然に
by brute force
荒々しい力で
by car [train, bus, ship, plane]
車［列車，バス，船，飛行機］で（◆無冠詞は手段を表す）
by Christ
神にかけて，きっと
by classification
類別すれば
by common consent
満場一致で；万人が認めるように
by common [mutual, general] consent
満場一致で
by compulsion
強制的に
by conservative estimate
控え目に見積もっても
by considerable
多量に，大いに
