desertification /dɪˌzɜːtɪfɪˈkeɪʃən/

• 1. 

  N-UNCOUNT Desertification is the process by which a piece of land becomes dry, empty, and unsuitable for growing trees or crops on. 荒漠化

  例：

  A third of Africa is under threat of desertification.

  三分之一的非洲大陆面临着荒漠化的威胁。