在班级里不能跑英语可以说成"Running is not allowed in the classroom"，这句话的来源是规定学校或教室内的行为准则，旨在维护教室秩序和安全。
一些英文例句和中文翻译如下：
"Please remember that running is not allowed in the classroom." (请记住，在教室内不能跑步。)
"The rule is no running in the classroom. Can you follow that, please?" (规则是在教室内不能跑步。你能遵守这个规则吗？)
"It's important to follow the rule of no running in the classroom to ensure the safety of everyone." (遵守在教室内不能跑步的规则很重要，以确保每个人的安全。)
一些英文例句和中文翻译如下：
"Please remember that running is not allowed in the classroom." (请记住，在教室内不能跑步。)
"The rule is no running in the classroom. Can you follow that, please?" (规则是在教室内不能跑步。你能遵守这个规则吗？)
"It's important to follow the rule of no running in the classroom to ensure the safety of everyone." (遵守在教室内不能跑步的规则很重要，以确保每个人的安全。)