vertical gardening
noun [ U ] uk/ˌvɜː.tɪ.kəl ˈɡɑː.dən.ɪŋ/ us/ˌvɝː.t̬ə.kəl ˈɡɑːr.dən.ɪŋ/
垂直园艺
the activity of making plants grow up a wall or out of a wall, often because there is not much space available on the ground
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