如果没有连接到互联网，一旦机器已经升级到Windows7，很难获得最新的驱动程序。
Without an Internet connection, it will be difficult to get other drivers and programs once the machine has been upgraded to Windows 7.
如果只使用一个数据库连接，则很难获得最优的数据库性能。
Using a single connection to a database makes optimal database performance difficult to obtain.
如果只使用一个数据库连接，则很难获得最优的数据库性能。
Using a single connection to a database makes optimal database performance difficult to obtain.
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