The legal deposit system is the basis for the long-term preservation of digital resources.
数字资源长期保存的基础是国家的呈缴制度。
参考来源 - 数字资源长期保存的法律问题研究And for the expensive cost in obtaining and the value of long-term preservation, remote-sensing images need to be carried on lossless compression.
遥感图像由于获取成本较高，具有长期保存的价值，需要进行无失真压缩。
参考来源 - H.264中熵编码研究及其在遥感图像压缩中的应用·2,447,543篇论文数据，部分数据来源于NoteExpress
Digital migration is a strategy of the long-term preservation of digital resources.
数字迁移是数字资源长久保存的策略之一。
Liquid nitrogen was shown to be an effective measure for long-term preservation of cultured hepatoma cells.
因而证明，液氮冻存法是培养细胞长期保种的一个行之有效的方法。
Records identified for continuing retention need to be stored in environments conducive to their long-term preservation.
已被识别须持续保存的档案，应该被存放在一个能促进档案长期保存的环境中。
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