There are some common sense in the printing of books and periodicals:
1.叠印问题，举例说某红色 底板上压有一行黑色字，那么在该菲林的红色版上，黑色字所处位置就不应该掏空。
1. Contained, for example, said press black words on the floor of one red. Then in the film version of the red, black words are at the position they should not be empty.
2.掏空问题，举例说一红色底板上压有一行蓝色字，那么在该菲林的红色版上，蓝色字所处位置就必须为空。反之蓝版亦然。
2. Hollowed - out problem, for example say a red floor is pressed on the a row of blue words, then in the film version of the red, blue word location must be empty. And vice versa.
3.输出时的挂网精度。 挂网精度一般称为挂网目，挂网的精度越高，印刷成品就越精美，但与纸张、油墨等有较大关系。
3 output when the hanging network accuracy. Hanging net precision commonly known as the hanging mesh, hanging network, the precision is high, finished printing more exquisite, but with ink and paper, have great relationship.
4.四色字问题。输出前必须检查出版物文件内黑色字，特别是小字，是不是只有黑板上有，而在其它三色版上不应该出现。
4 four color word problem. Output must check the publication file black word, especially the small print, is not only on the blackboard, and in other trichromatic should not appear.
