如果时间间隔较大，则中断阈值可能达到可被黑客利用的程度，于是对正常运行时间有效性造成不利影响。
If the time gap is large, interruption thresholds could reach the level that could be exploited by a hacker, causing an adverse impact on the uptime availability.
另外，各种燃料的污染程度以及造成的健康危害，资源的有效利用率，能源供应的可靠性也都在考量范围内。
Also considered were the fuel's impact on pollution and therefore human health, the availability of necessary resources, and the energy form's reliability.
指特定用户为了在特定使用环境下能够以何种程度利用某种产品，以有效地达到特定目的，取得满意的效果。
"[Usability is] the extent to which a product can be used by specified users to achieve specified goals with effectiveness, efficiency and satisfaction in a specified context of use." - ISO 9241-11.
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