default option

例句：

1. 1. The default settingfor this feature is to turn it off.
   此功能的缺省设置是关闭它。
2. 2.If you don't provide a password, the system will use the default one.
   如果你不提供密码，系统将使用缺省密码。
3. 3. Default settings are usuallyset by the operating system.
   缺省设置通常由操作系统设定。