-----------------------------------
話題， わだい
1. topic, subject
2. much talked about, topical, in the news, hot
主题；备受热议的、时下热门的、新闻焦点、热门话题
-----------------------------------
を
1. indicates direct object of action
2. indicates subject of causative expression
3. indicates an area traversed
4. indicates time (period) over which action takes place
5. indicates point of departure or separation of action
6. indicates object of d...
表示动作的直接对象；表示经过的场所；表示离开或分开的点
-----------------------------------
変える， かえる
1. to change, to alter, to transform, to convert, to turn, to vary
2. to reform, to revise, to amend
改变；改革，修订，修正