Choosing such defaults greatly reduces the amount of information that administrators must supply when installing applications.

选择这样的缺省值极大地减少了管理员必须在安装应用程序时提供的信息量。

Both agencies define spare capacity as the amount of extra supply that could be turned on within 30 days and kept on for 90 days.

两家机构都将备用产能定义为30天内即可使用、并可以保持90天的额外供应。

National Grid reckons that compensating for that uncertainty of supply will require a huge amount of over-engineering.

国家电网公司(National Grid)认为，要想消除风能供电的不确定性，得需要巨量的“过建工程”。