源头 /yuántóu/ angolul

fountainhead▼(a spring that is the source of a river)
noun
[UK: ˈfaʊntɪnˈhɛd] [US: ˈfaʊntɪnˈhɛd]

origin [origins]▼(beginning of something)
noun
[UK: ˈɒr.ɪdʒ.ɪn] [US: ˈɔːr.ɪdʒ.ɪn]