retention requirement

In this paper, the advantages of gain cell such as small cell size, logic process compatibility and etc are discussed. Furthermore, four design difficulties, small data retention time, negative voltage requirement, temperature and disturbance sensibility of data retention time are performed detailedly.

重点讨论了该核心单元面积小、与逻辑工艺完全兼容等优点，并提出其设计中的四个难点&数据保持时间短、操作需要负电压、数据保持时间的温度敏感性及易受干扰特性。

The most important requirement is to achieve an adequate retention of the preservative within the wood.

木材防腐处理的一个最重要的要求,就是要使防腐剂吸收量达到适当指标.

The current management system and research cannot meet the requirement of large-scale construction of retention dams.

现有的管理机制和科研基础,不能适应淤地坝大规模建设新形势的要求.