Say the important things three times, the quality is low, the quality is low, and the quality is low. Thick-skinned people usually answer the phone in the library with a loud voice. Go to the library to study. Since it is for studying, it is recommended that the mobile phone be turned off. If you can't turn off your mobile phone, I suggest you change it. If you are a busy person, it is recommended to turn it to mute or vibrate, and try to go out when answering the phone. No matter what the quality, they are all self-centered ivory tower people or a little psychological distortion trying to attract others' attention in the library. That's about it.