When societies cooperate with the aim of creating a public good, there is always the possibility of a free-rider.

VOA: special.2009.03.03

And a few people will need to throw 2, if you feel like you have particularly good aim.

每个人一个，有些人可以扔两个。

麻省理工公开课 - 化学原理课程节选

The aim of this, that I think is a good aim, it's an educational project, and I'm hoping you'll help us with it.

这完全出于好意,这是个教育项目,我也希望你们也能尽己所能把它做好

耶鲁公开课 - 博弈论课程节选

She had good aim, Mme.

NEWYORKER: The Stolen Pigeons

So the Swedes can justly feel that they have made good on their aim to crack on with the enlargement negotiations.

ECONOMIST: The EU��s summit in Gothenburg

All four men had denied the fraud charges, claiming the tax credit applications were made in good faith with the aim of making the movie.

BBC: Film fraudsters jailed over tax scam