proof of journal

例句：

1. 1. The library has a collection of rare books that are available for loan.
   图书馆有一套稀有书籍，可供借阅。
2. 2. The researcher needed the proof of the experiment to publish in a scientific journal.
   研究员需要实验证明才能在科学期刊上发表。
3. 3. The author sent a copy of his book to the publisher as proof of its quality.
   作者向出版社发送了一本书的副本，作为其质量的证明。