compassion fatigue
noun [ U ] uk/kəmˈpæʃ.ən fəˌtiːɡ/ us/kəmˈpæʃ.ən fəˌtiːɡ/
同情心疲劳，同情心淡漠（指因为影响人数众多的问题持续太久而使人不再关心、不再捐钱）
the situation in which people stop thinking or worrying about a problem that is affecting a lot of people and stop giving money to them because the problem has continued for too long