This is a problem because if the teacher wants to enter vocabulary words, she must either write them out to the students, set aside time for them to transcribe into a dictionary, or give them a transcript as homework. The first variant is demanding, especially time consuming, for teachers. Words to list, attribute pronunciation and translation, type in a computer and print. The other two variants transfer responsibility to the student.
This is a problem because if the teacher wants to enter vocabulary words, she must either write them out to the students, set aside time for them to transcribe into a dictionary, or give them a transcript as homework.