classes: lecturer. especially her conveying ability is not good, her speaking English is not good, easy to cause drowsiness. curriculum. especially her conveying ability is not good, her speaking English is not good, easy to cause drowsiness. facility. especially her conveying ability is not good, her speaking English is not good, easy to cause drowsiness. general. especially her conveying ability is not good, her speaking English is not good, easy to cause drowsiness.