注释和标记 meaning in English

notes and labels

Comments and remarks can even quote precisely part numbers if replacements would be needed
注释和标记甚至还可以准确地引用零件号，如果需要更换零件的话。
Adding comments and remarks enables any technician ( and not just a person who developed the system ) to understand a ladder diagram right away
添加注释和标记可以使技术人员（不仅仅是开发人员）很快理解梯形图。