形容词

1. He opened the door with a duplicate key.
他用一把复制的钥匙打开了门。

及物动词

1. All the members received duplicated notices of the meeting.
所有会员都接到同样的会议通知。

2. He duplicated his former mistakes.
他又犯了和以前一样的错误。

名词

1. Keep a duplicate of the letter.
保存一份信的副本。

1. duplicate：dup; 复制(品

noun

1. a copy that corresponds to an original exactly

e.g. he made a duplicate for the files

Synonym: duplication

2. something additional of the same kind

e.g. he always carried extras in case of an emergency

Synonym: extra