classes: lecturer. there will be a specific attendance announcement on the machine room to fix the exercise for those who do not understand how to do. curriculum. there will be a specific attendance announcement on the machine room to fix the exercise for those who do not understand how to do. facility. there will be a specific attendance announcement on the machine room to fix the exercise for those who do not understand how to do. general. there will be a specific attendance announcement on the machine room to fix the exercise for those who do not understand how to do.