1．twice：adv.两次; 两遍; 两倍;
2．[例句]He visited me twice that fall and called me on the telephone often.那年秋天他来看过我两次，而且经常给我打电话。
3．I phoned twice a day, leaving messages with his wife.我每天打两次电话，托他妻子捎口信。
