These syncs occur unobtrusively, and don't require any action on the part of the user after the initial setup, nor do syncs incur any extra fees like text-messaging charges.

这些同步都在后台进行，用户进行过初始设置后不再需要进行更改，也不收取额外的信息费。

youdao

These syncs occur unobtrusively, and don't require any action on the part of the user after the initial setup, nor do syncs incur any extra fees like text-messaging charges.

这些同步都在后台进行，用户进行过初始设置后不再需要进行更改，也不收取额外的信息费。

youdao