主题句原则
国有其君，家有其主，文章也要有其主。否则会给人造成“群龙无首”之感!相信各位读过一些破烂文学，故意把主体隐藏在文章之内，结果造成我们稀里糊涂，不知所云。所以奉劝各位一定要写一个主题句，放在文章的开头(保险型)或者结尾，让读者一目了然，必会平安无事!
特别提示：隐藏主体句可是要冒险的
To begin with, you must work hard at your lessons and be fully prepared before the exam(主题句). Without sufficient preparation, you can hardly expect to answer all the questions correctly.
