Dear Peter,
亲爱的彼得，
I'm glad to receive your email. As it is required,you are supposed to hand in the poster before next Friday.
我很高兴收到你的电子邮件。根据要求，你应该在下周五前交上海报。
Being your close friend,I am extremely willing to share some ideas about designing the poster with you.First and foremost,the basic safety rules are of great importance,which should be included in your poster.In the second place,following the safety rules is so meaningful and crucial that you had better remind your readers of its significance and advise them to be careful both in and out of school.Last but by no means least,if I were you,I would add a few suggestions about safety awareness,considering that better safe than sorry.In addition,it is a good idea for you to draw a few pictures on your poster so as to make it more lively and acceptable.
作为你的密友，我非常愿意和你分享一些关于海报设计的想法。首先，基本安全规则非常重要，应该包含在你的海报中。其次，遵守安全规则是如此有意义和关键，你最好提醒你的读者它的重要性，并建议他们在校内和校外都要小心。最后，但绝不是最不重要的，如果我是你，我会补充一些关于安全意识的建议，考虑到安全比抱歉好。此外，你最好在你的海报上画几张图片，这样更生动、更容易接受。
If there is anything more that I can help with, please let me know.
如果还有什么需要我帮忙的，请告诉我。
是你的，
Li Hua
是李华