dl dt {
    margin-bottom: 1em;
}
dl dd ol li {
    margin-bottom: .5em;
    line-height: 2em;
}
dl dd ol li ol {
    list-style: none;
    padding: 0 0 0 .5em;
}
dl dd ol li ol li {
    counter-increment: cnt;
}
dl dd ol li ol li:before {
    content: "（" counter(cnt) "）";
}