國慶日 angolul

national day▼(day marking a country's establishment)
noun

national holiday [national holidays]▼(statutory holiday enacted by a country to commemorate the country itself)
noun
[UK: ˈnæ.ʃnəl ˈhɒl.ə.deɪ] [US: ˈnæ.ʃə.nəl ˈhɑːl.ə.deɪ]