If the forest gets dry enough, air can get into the vessels that carry water through a tree - kind of like an air bubble in a fuel line - and a tree dies.
如果森林干旱到一定的程度，夹杂着空气的水就会从导管进入植物内部——这就像燃油管里的气泡一样——植物会因此而死。
They stood in the dry grass, looking up at the crow; and the crow, on the rigid bough of the tree, its head drawn in, perched immobile as iron.
两人站在枯草丛里，仰面看那乌鸦；那乌鸦也在笔直的树枝间，缩着头，铁铸一般站着。
If this tree-planting experiment works in the Negev Desert, forests might be able to grow in many barren parts of the world that are too dry for most trees.
如果这项植树计划在内盖夫沙漠试验成功的话，或许在世界上许多因干燥而使植物难以生长的不毛之地，都可以植树造林的。
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