by oneself

独立地,单独地

by chance, by choice, by comparison, by courtesy of, by error, by far, by force, by hand, by heart, by instinct, 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 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 turns, by virtue of, by way of, by worthy of, by yourself, by-election, by-law, by-play, by-product, by-road, bye,