classes:  lecturer. The practical lab is too old, so improve and build a lab system so that students can practice the skills of this subject.  curriculum. The practical lab is too old, so improve and build a lab system so that students can practice the skills of this subject.  facility. The practical lab is too old, so improve and build a lab system so that students can practice the skills of this subject.  general. The practical lab is too old, so improve and build a lab system so that students can practice the skills of this subject.