work at

从事于，致力于

woolly (US also wooly), woolly-minded, woozy, wop, word, word for word, word processing, word processor, word-blindness, word-perfect (US ,letter-perfect), wordily, wordiness, wording, wordless, words, wordsmith, wordy, wore, work, work against, work for, work hard, work hard at..., work of art, work off, work on, work one's way, work out, work round to sth/sb, work sb over, work sth off, work sth up, work study, work to sth, work top (also `work surface), work towards sth, work up, work-basket, work-bench, work-force,