twiceadv.两倍;两次
twice-graded双重分次的
Twice requests两次请求
Twice ordering二次订货
twice algorithm二次算法
Twice selection一次选择法
twice pollution二次污染
Twice a week.一星期两次.
twice or thrice两三次
twice evolution二次演化
twice told talen.陈旧的故事(尽人皆知的事情)