However such "contracts" are imperfect as the impracticality to include every action of the agent whose decisions has an impact on their and the principal's benefits.

然而这样的合同是不完善的，里面不包括代理人的每一个行为，其决定对其和主要利益的影响。

youdao

The EV-1 was on the market in the 1990s, but GM discontinued it because of impracticality.

VOA: standard.2010.07.30

The resilience of the two main communities obliges each to recognise the impracticality of its maximal demands.

ECONOMIST: Hope in a hate-infected city

Mr Bush has probably by now accepted the impracticality of instructing Mr Abbas to go after the militant factions with force.

ECONOMIST: And ways to keep it alight

All these proposals suffer from the problem of extreme impracticality, though.

CNN: Time travel: Can it really be done?