It's the overall anxiety throughout the process and the fact that you can't even tell if your fellow passenger is smiling which is why I did give my flight attendants plenty of thumbs up.
Here are some examples about the situation: When the teacher asks me, " Do you have any questions? " Or when the flight attendant asks me. " Do you need coffee? " Thanks! – Ryan.
当老师问我,“Do you have any questions?”或者当问我时,“Do you need coffee?”。谢谢!