"Pay attention to safety during class" 或者 "Observe safety precautions during class" 都可以用来表示 "Pay attention to safety during class" 的意思。这个短语的来源可能源自于教育机构或者工作单位的安全规定，旨在提醒学生或员工在课堂或工作时要注意安全。
一些英文例句和中文翻译如下：
Please pay attention to safety during class. 请在上课时注意安全。
Make sure to observe safety precautions during lab experiments. 在实验室做实验时，一定要注意安全预防措施。
Safety is our top priority, so please pay attention to safety during class. 安全是我们的首要任务，所以请在上课时注意安全。
一些英文例句和中文翻译如下：
Please pay attention to safety during class. 请在上课时注意安全。
Make sure to observe safety precautions during lab experiments. 在实验室做实验时，一定要注意安全预防措施。
Safety is our top priority, so please pay attention to safety during class. 安全是我们的首要任务，所以请在上课时注意安全。