He learned a lesson at the cost of blood.

他以血的代价吸取了教训。

I hold to my belief that development shouldn't be at the cost of the environment.

我坚信发展不应该以环境为代价。

UR ensures the highest level of performance at the cost of some data inconsistency.

UR 以牺牲某些数据的不一致性为代价，确保了最高级别的性能。

I have never regret sending the old lady to hospital at the cost of missing the interview.

我从未后悔因为送那位老人家去医院而错过了面试。

By using stale metaphors, similes, and idioms, you save much mental effort, at the cost of leaving your meaning vague.

使用陈腐的暗喻、明喻和习语，你省了不少思考的力气，代价是你的意义的模糊。