by the exercise of muscles
筋肉を使って，腕ずくで
by the irony of fate
運命の皮肉によって
by [under, in] the light of a lamp
ランプの光の下で
by the light of the moon
月明かりで
by the month
月ぎめで
by the pricking of my thumbs
虫の知らせで
by [through] the recommendation of a friend
友人の推薦で
by [at, on] the roadside
路傍に
by the rules
ルールに従って
by the score
まとまって，大量に
