So much depends on the character and condition of the individual patient that an abstract determination of our duty based on 'balance' or 'stringency' is useless.

这种情况更依赖于那个病人的品质和状态，因此一个基于平衡和决策的抽象的决策方法就是无用的。

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For hydropower station, monitoring system is the base of it's integrated automation, and is the premise of realizing the condition that nobody is needed on duty (or few on duty).

水电站监控系统是实现水电站综合自动化的基础，也是实现水电站无人值班(少人值守)的前提条件。

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Medieval system, where land was grant by a king to his aristocracy, and by the aristocrat to the peasant, on condition that each pay a service (or feudal duty) to his superior.

一种中世纪的制度：国王将土地转让给贵族，贵族再转让给农民。条件是每个人必须向他上级服役或交税。

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