最近好像在系统升级中，造成了不少使用上的问题。

我也发现了 最近刚中了一篇文章  已经proof了 迟迟不见online     以前一两天就online了

多篇文章最proof 也未online

Dear Dr,

Thank you for your query.

There is currently a delay in publishing articles and issues on ScienceDirect and other platforms due to technical problems. Technology teams are working on it with very high level of priority and we hope to be able to publish these articles online shortly.

Kindly do let me know if I can be of any further assistance

Regards,
Pradeep，