But whatever doubts fans and critics may have had that U2 had gone mainstream， or had grown too confident， were erased with the release of 1991's Achtung Baby.
But whatever doubts fans and critics may have had that U2 had gone mainstream， or had grown too confident， were erased with the release of 1991's Achtung Baby.
U2是否已成为主流乐队，它是否过于自信，无论歌迷或评论家的疑惑如何，1991年《阿什堂宝贝》的发行令一切疑虑烟消云散。