单词 后策 例句 DEFINITIVE EXAMPLES 权威例句〔behind〕Police believe that a racist group is behind the attacks.警方认为是一个种族主义集团在幕后策划了这些袭击。麦克米伦高阶〔brain〕Danny's definitely the brains of the project.丹尼肯定是这个项目的幕后策划者...