by oneself 独自地
by sea/ship 乘船
by spaceship 乘宇宙飞船
by the month/dozen /ton/pound/yard) 按月/打/吨/磅/ 码计费
by the end of 在……结束之前
by the moment 到那时候
by the side of 在……附近, 在……旁边
by the time +从句，＋主句 到……的时候，截止
by the way 顺便说, 顺便问一下
by this means 通过这种方式
