different 普通用词，强调事物间的区别或本质的不同。有时侧重对比，不着重差别。
various 通常强调种类的数目。
diverse 语气较强，指性质完全不同，着重显著的区别。
参考例句
1. The reason is various. 原因是多方面的。
2. For this I always Be doing various effort. 为此我一直在做着各种的努力。
3. Why do the various characters need so much money? 为什么不同的角色都需要这么多金钱？
英英解释
adj.
1. of many different kinds purposefully arranged but lacking any uniformity
2. considered individually
3. distinctly dissimilar or unlike
4. having great diversity or variety
