HSK 7-9
连绵
liánmián动
continuous; unbroken; uninterrupted; extending forever into the distance (of mountain range, river etc)
窗外群山连绵直至天边。
Chuāngwài qúnshān liánmián zhízhì tiānbiān.
Beyond the window, an unbroken range of mountains extends to the horizon.
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Appears across levels (7-9) in the HSK 3.0 word list.