在喝白酒、黄酒、啤酒的频率中,如果任意一个是often,那么ac就等于3；Among the frequencies of drinking lique,wine and beer,if any of them is often,ac equals 3;
　　否则（即剩下的情况）,任意一个频率（指喝白酒、黄酒、啤酒的频率）是sometimes,那么ac就等于2；Or any is sometimes,ac equals 2;
　　否则,任意一个频率是previously often,那么ac就等于1；Or any is previous often,ac equals 1;
　　否则,任意一个频率是never,那么ac就等于0；Or any is never,ac equals 0;
　　当三个频率都缺失时,ac也缺失.And when none of the three exists,ac doesn't exist in turn.