属性是否应与密钥一起永久性保存。

Whether the property should be persisted with the key.

youdao

可永久性保存档案或文件。

Could keep the file or document for a long time.

youdao

分析油渍现象产生的原因，采取适当的措施加以预防，对胶片的永久性保存具有重要意义。

It analyzes the reason of grease phenomenon and taking appropriate precaution have great significance on the film's permanent preservation.

youdao