The areas that are now desert were, like all arid regions, very susceptible to cycles of higher and lower levels of rainfall, resulting in major, sudden changes in distributions of plants and animals.
那片现在是沙漠的地区和所有干旱地区一样，对降雨量相对更大或更小的周期极为敏感，因此那里的动植物分布发生了巨大且迅速的变化。
Cold drought-tolerant native trees and desert plants are selected to adapt to local climate and improve the residential environment in arid areas.
选择耐寒耐旱的乡土树种和荒漠植物来适应气候并改善干旱区城市居住区环境。
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