如果需要撤销操作，那么必须擦除整个块(将所有数据重置回状态1)。

If the reverse operation is needed, then the block must be erased (to reset all bits to the one state).

youdao

挑战在于管理用户的数据，尤其一些常规的变更像密码重置和帐号注册等。

The challenge is managing data about users, especially routine changes like password resets and account registrations.

youdao

在服务器上，除了在处理请求时以某种方式传输（哑元）数据以避免浏览器重置连接之外，几乎无法影响此行为。

There is little you can do on the server to influence this, other than somehow transfer (dummy) data while working on a request to prevent the browser from resetting a connection.

youdao