exchange?�が?�詞?�し?�使?�れ?�場?�、物?�人?�元?�の位置?�状?�か?�新?�い?�の?�交?�さ?�る?�と?�示?�。具体的?�例?�以下に示す??Lecturers won't ever be replaced by computer systems during the classroom. These actions by no means swap the necessity for normal basic safety check