B 开头单词

by marriage 與婚姻有關的

by many accounts 在很多人看來

by mail 郵寄；通過寫信，通過郵遞；按信件

by machine

by lysis 轉輕期

by lumbar [毉葯科學]腰椎給葯

by lucky coincidence 機緣巧郃 碰巧

by luck 僥幸地

by love possessed

by line

by light

by letter 以書信形式

by leaps and bounds adv. 飛躍地，突飛猛進地

by law n. 根據法律，在法律上；附則

by land 由陸路

by lack of 因沒有...；因缺乏...

by jove 天啊（非正式，表示驚訝或強調）

by jingo

by itself 單獨地；自動地

by itsef 獨自地；自動地