a(an)

art.(非特指的)一(个)；任何一个；每一(个)

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 series of, a sword of `Damocles, a variety of, a wilderness of, 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, abaft, abandon, abandon (also abandonment), abandoned,