1. Respect for historical and humanitarian values: Hiroshima was an atomic bomb dropped by the United States on Japan during World War II, causing a large number of innocent civilian casualties. We should treat historical humanitarian disasters with respect and concern, avoid unreasonable discrimination and contempt for victims and historical events, and avoid personal emotionalism. 2. Consider social and cultural background: speech is restricted by social and cultural background, rather than just saying what you want to say, regardless of public feelings. Different countries and cultures may have different views on historical events and international affairs due to geographical, historical and cultural factors. Therefore, we should also consider the social and cultural background of foreign students' speeches, avoid making too arbitrary comments on them, hurt the feelings of local people, touch the emotional red line of local people, and easily lead to conflicts. 3. Respect other people's opinions and diverse viewpoints: On the premise of freedom of speech, don't touch the bottom line of public feelings. We should respect the opinions and viewpoints of others, including different views on the original explosion in Hiroshima. Respecting other people's viewpoints and conducting rational debates and exchanges will help promote understanding, tolerance and harmony. Generally speaking, public comments on the original explosion in Hiroshima should be euphemistically expressed on the premise of respecting historical facts, feelings of others, public sentiment and social values, and observing laws, regulations and social ethics. At the same time of freedom of speech, we should also pay attention to respect and restraint of speech to avoid unnecessary troubles caused by excessive or offensive speech, so as to maintain a harmonious social atmosphere and good interpersonal relationships.