C2 adjective /ˌsuː.pər.ɪˈrɑː.ɡə.tɔːr.i/
supererogatory
超额的
Meaning
Going beyond what is required or expected; more than necessary.
Example
His donation was supererogatory, far beyond what anyone had asked for.
他的捐赠是超额的,远远超过任何人要求的。