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。
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.
迄今为止，要想获取某一物品的高质量扫描件或照片，机构往往会征收费用，并对使用施加额外的限制。
To obtain a high-quality scan or photograph of an item, institutions have hitherto tended to charge fees and impose additional restrictions on usage.
美国出口法律法规规定了有关可将哪些物品出口到境外的哪些对象的限制。
United States export regulations define restrictions for what can be exported outside of its borders and to whom.
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