是He'got a uniform.还是He's got an uniform?

是He'got a uniform.还是He's got an uniform? a uniform还是an uniform 在英语里,是a uniform,还是an uniform a还是an uniform uniform前+a还是an "a uniform" or "an uniform"? "uniform"的前面是加"a",还是加"an"? he sometimes wears a white uniform wear a uniform 还是wear uniform he got an idea So he usually wears a uniform on his birthday.It`s the last He was going to lend me a policeman's uniform so that I coul