by leaps and bounds

飞速地，突飞猛进地

by accident, by air, by all means, by all nerves, by analogy, by and by, by and large, by any means, 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 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 turns, by virtue of, by way of,