该系统能在安全高效的基础上运行。
垂直农场需要高效、廉价的建设和安全的运营。
Vertical farms would need to be efficient, cheap to construct and safe to operate.
国家的基本功能是提供实体安全、高效的机构以及有力的行政管理。
The basic functions of a state are to provide physical security, efficient institutions and capable administration.
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