Saline soils, which have high concentrations of sodium chloride and other salts, limit plant growth, and research continues to focus on developing salt-tolerant varieties of agricultural crops.
盐碱地含有高浓度的氯化钠和其他盐类，限制了植物的生长，研究继续集中于开发耐盐的农作物品种。
2
These scenarios give us reason tolimit our growth and reduce our impact on global ecosystems.
这些揣测给出我们理由来限制我们的增长，并减少对全球生态系统的影响。
3
SINCE 1979 China has undertaken a bold demographic experiment to reduce its population growth, placing a limit on the number of children many couples can have: one.