地下的 /dìxià de/ angolul

clandestine▼(done or kept in secret)
adjective
[UK: klæn.ˈde.stɪn] [US: klæn.ˈde.stən]

underground▼(hidden, furtive)
adjective
[UK: ˈʌn.də.ɡraʊnd] [US: ˈʌn.dər.ˌɡrɑːwnd]