This would mean that an extra burden would be put on our already enfeebled economy.这意味着将给我们已然衰退的经济增加额外的负担。The journey would impose extra expense on those least able to afford it.这次旅行会给那些最负担不起的人增加额外的开支。High blood pressure imposes an extra load on the heart.高血压会给心脏增加额外的负担。