如果您要在演讲中给听众提出劝告，那么您可以在开头说：
"Ladies and gentlemen, today I want to talk to you about a topic that is important to us all and offer some advice on how to handle it. (指定主题)"
或者：
"Good evening, everyone. I'm here today to share some thoughts with you on a subject that I bepeve is crucial, and to offer some advice on how to approach it. (指定主题)"
这样的开场白既可以吸引听众的注意力，又能让他们知道您接下来要提出的内容。此外，您还可以引入一些背景信息，以便听众能够更好地理解您要讲的内容。例如：
"As you all know, (某件事情) has been a hot topic in the news lately, and many of us have been struggpng with how to deal with it. (介绍自己对此事情的经验或研究结果)"
希望这些建议对您有所帮助。