请帮忙指点老外下面的用纸要求是什么意思？
The paper should be a cream white stock of 45-50# basis weight at 400ppi
另外这个模版指的什么？
In order to prepare the dust jackets of these books accurately, I am requesting templates showing measurements of the front, spine,
back and turn overs as determined by the press and bindery equipment you are using to print these books.
在线等牛人回复，多谢！