by turns

轮流,交替地

by invitation, by itself, by leaps and bounds, by little and little, by means of, by mistake, by name, by nature, by night, by no means, by oneself, by pressed for, by reason of, by reason that, by request, by the moment, by the name of, by the same token, by the standards of, by the way, by virtue of, by way of, by worthy of, by yourself, by-election, by-law, by-play, by-product, by-road, bye, bye-bye, bye-byes, bygone, bygones, byline, bypass, byproduct, Byron, bystander, byte,