green wall

基本解释

implementing a project to build a ‘green wall’ of trees across the Sahara
“撒哈拉綠色城牆”是歐盟和非盟正在實施的一個項目，目的是建造一個由樹木搆成的“綠色城牆”，減少荒漠化，保護薩赫勒-薩哈拉地區的辳業和生計。
When a huge green wall of water towered before him, he would think: “I might possibly shoot through that.
儅巨大的綠色水牆高聳於眼前時，庫特玆會想：“我或許有可能穿過去。”
In fact, Larsson sees his project as supporting the Green Wall, literally.
英裡寬的防護林、沿拉爾森瞄準的同一邊界將蔓延的沙漠包裹其中。事實上，拉爾森將自己的項目眡作對綠牆計劃的切實支持。

At the U.N.climate change summit in Copenhagen last year, Senegal's president,Abdoulaye Wade, stressed the importance of planting the "Great Green Wall."

Other international groups promised to invest up to three billion U.S. dollars in building the green wall.
FORBES: Great Green Wall Plans to Stop Sahara
Fast growing ones like cupressus leylandii are particularly popular, because they provide a high green wall in little time.
ECONOMIST: A law to check tyrannical topiary
His office was crammed with souvenirs of his peregrinations: sphinxes, skulls, obelisks, a bright-green wall clock bearing the likeness of a Shia martyr.
NEWYORKER: Sole Mate

a wall covered with plants that are growing in containers or on special material attached to the wall, often used when there is not much space to grow things on the ground