• 1. append only mode: 追加模式 | 追加形式

• 1.Append mode is supported only for the existing XCode projects generated with the same Unity iOS version.
  追加模式仅支持现有的X code项目，带有有相同的Unity iOS版本生成。
  dict.yoduao.com
• 2.A file with the 'a' attribute set can only be open in append mode for writing. Only the superuser or a process possessing the CAP_LINUX_IMMUTABLE capability can set or clear this attribute.
  如果文件设置了‘a’属性，数据只能采用追加模式，仅仅超级用户或者拥有CAP _ LINUX _ IMMUTABLE能力的进程可以设置和删除该属性。
  dict.yoduao.com

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