的意思 a back number

1. This book is a back number, but it still contains valuable information.
这本书是一本过时的书，但仍然包含有价值的信息。

2. He considers himself a back number in the technology industry.
他认为自己在技术行业已经过时了。

3. The company decided to replace the old software with a back number.
公司决定用一款过时的软件来替代旧软件。

4. She was surprised to see her old artwork featured in a back number of the magazine.
她惊讶地看到自己的老作品被刊登在一本过时的杂志上。

5. The professor is considered a back number in the field of psychology.
这位教授在心理学领域被认为是一位过时的人物。

6. The fashion designer decided to revive a back number from the 80s for their latest collection.
这位时尚设计师决定在最新系列中复刻80年代的一款过时设计。