Topic 1: Increasing travels between countries enable people to learn different cultures or to increase tension between people from different countries

Ethical + code, concern, consideration, dilemma, implication, issue, lapse, principle, problem, question, reason, standard, value

Ethnic + background, community, conflict, difference, diversity, division, group, identity, minority, origin, tension, violence

Experienced + people, player, practitioner, professional, staff, teacher, worker, user

Extensive + collection, coverage, damage, discussion, experience, knowledge, research, review, study, survey, use

External + affair, agency, appearance, constraint, environment, factor, force, influence, pressure, reality, source, stimulus, threat, use, world