as I alluded to earliera discourse marker used to refer back to a point made earlier in the lectureAs I alluded to earlier, the second law of thermodynamics places limits on efficiency.NoteAs I alluded to earlier, the second law of thermodynamics places limits on efficiency.Elon.io is an online learning platformWe have an entire course teaching TOEFL Academic Vocabulary grammar and vocabulary.Start learning TOEFL Academic Vocabulary now