Why can't I find the paper published in the middle school chemistry reference?
A: There may be two reasons. The 1 type has just been published and has not been sent to the database. Or it was sent to the database, but people haven't had time to enter it yet. In this case, nature can't find it. Let's talk about the journals of HowNet. Even if they have been published, you will have to wait at least one or two months to find them on HowNet.