The teacher is spitting during the lecture, and the classmate in the front row is very distressed. How should I tell him tactfully?

I think this is a very embarrassing thing. No matter what you say, it will make the teacher unable to get off the stage. You can think about it from his perspective. I think we can only think of other ways. We can only use intelligence and not attack by force. Think about it for a moment, if your students said to you that your mouth was like a watering can and it hit their face, how would you feel?

I can give some suggestions here, which I have learned from other students. If a teacher has this kind of watering can, then we must make a prediction in advance. Before attending his class, you should prepare a mask, and it is best to put on your glasses, so as to avoid injury to the greatest extent. If you can convince the teacher that the weather is bad today, it is best to wear a mask as well. Teacher Deng took the initiative to put on the watering can Isolation, then this approach is the best.

In addition to wearing glasses or masks, another way is to hold an umbrella. Of course, holding an umbrella indoors is a bit exaggerated, but there is nothing you can do about it. If the firepower ahead is too fierce, don’t hold an umbrella. It's really impossible to resist, so it's best to carry an umbrella with you at all times. When you find that it's time to take his class, take out the umbrella and be ready to resist any sudden attacks.

If that still doesn't work, then you can only ask the class teacher to adjust the seats and let those students with stronger endurance come to the front to face the artillery charge.