将下面这封邮件翻译成英语。内容应保持不变。文中不得出现“the”以外的任何冠词。这里的格式要求是首行以收件人称呼开头，紧接着是换行符，之后是邮件内容，最后以一个换行符和你的签名结束。所有的标点符号都是英文格式。

李老师，
您好！

新课程已上线。我想通知您，这个课程非常适合您班上学生。能帮助他们更好地理解数学概念，提升解决问题能力。

感谢您宝贵时间阅读此邮件。如果有任何问题，可以随时联系我。

祝好，

张三
user
Li Teacher,
Hello!

New course has been launched. I would like to inform you this course is very suitable for students in your class. It can help them better understand math concepts, improve problem-solving skills.

Thank you for your valuable time reading this email. If any questions arise, please feel free to contact me.

Best regards,

Zhang San
assistant