I found the characters very two-dimensional and dull.

我觉得那些人物形象毫无深度且乏味无聊。

《柯林斯英汉双解大词典》

Part two: The modes, operation procedure and characters of three-dimensional teaching method.

第二部分：三维教学法的模式、操作程序和特点。

youdao

Part two: The modes, operation procedure and characters of three-dimensional teaching method.

第二部分：三维教学法的模式、操作程序和特点。

youdao