Mr. Smith, it is a notice to the audience. It says that we should enter the concert hall 30 minutes earlier before the concert starts. Entrance to the hall is by ticket only, each one each ticket.
史密斯先生，这是一则观众须知。上面说我们应该在音乐会开始前30分钟入场，每人凭票进入。
As a rule, food or drink should not be taken into the hall. Of course, smoking is not allowed in the hall either.
按照规定，食品和饮料不得带进场内，吸烟也是不允许的。
Please don't bring your digital camera with you because no photos can be taken during the concert. And what is more, beepers and mobile phones must be off during the concert.
请不要携带数码相机入内，因为场内严禁拍照。另外，音乐会期间，传呼机和手机必须关闭。
点评：文章的用词和句式有一定的难度，特别是关联词的运用，如of course，as a rule，and what is more使文章读起来朗朗上口，层层紧扣，环环递进，体现了作者较高的写作技巧和水平。