a series of

一系列,一连串

a great deal, a great deal of, a great many, a great/good deal of, a hard nut to crack, a kind of, a la carte, a la mode, A level, a little, a lot of, a matter of, a mite, a mountain of, a number of, a point of view, a posteriori, a priori, a problem (for sb.) to do, a scrap of, a sword of `Damocles, a variety of, a wilderness of, a(an), A, a, a-, A-bomb, A-OK, A-road, A-side, A.D., A.M., a/an, a/c, A/S level, AA, AAA, AB, aback, abacus,