万能理由：
1.Safe 安全的；healthy 健康的；clean 清洁的；environmental friendly 环保的；dangerous危险的；food security ,personal security,property security social security
2.Cheap 便宜的；low cost 成本低；save money；节约钱；expensive 昂贵的；high cost 成本高
3.Convenient方便的；save time 节省时间；a waste of time 浪费时间
4. Right 权利；fun 乐趣；pleasure 乐趣；relax 放松；interest 兴趣；teamwork 团队合作
5. Efficient 有效率的；fast 快速的；ensure the quality 确保质量
万能句子：
反对：
1.it is harmful to one's health（Because of...，sth will cause...,which harms one’s health,for example.... As a result...）
2. It is not convenient (Because of..., sb have difficulty doing sth, which is not convenient,for example..... As a result...)
3.it is relatively expensive (Because of the high cost, sth is expensive, which leads to the difficulty for sb to do sth. for example....As a result...)
4.it is not convenientBecause of ..., sth is not convenient, which leads to the difficulty for sb to do sth,for example..... As a result...
5.it is dangerous (Because of..., sb have difficulty doing sth, which is not dangerous. As a result...)
支持
1.it is one's right (Because of ..., sb have the right to do sth, for example, .... As a result...)
2.it is pleasurable and relaxing( Because sb is busy doing sth, ... Is a good way for sb to relax, which will bring them much pleasure. As a result,..)
3. It is good for one’s health(Becase of..., sth is beneficial to the health, for example, .... As a result,...)
4. It is efficient (Because of..., sb can save much time and money to do sth, for example, ... As a result...)
5. It is cheap (because of ..., sth is relatively cheap, people could save money. As a result, more people can benefit from it)。