Translation of "Expense" in Chinese

I don't care about the expense.

我不在乎花多少钱。

I had a good dinner at his expense.

他請我吃了頓美味的晚飯。

He did it at the expense of his health.

他以牺牲自己的健康为代价完成了这项工作。

John finished the work at the expense of his health.

約翰犧牲自己的健康，完成工作。

The total expense for the project amounts to one hundred million yen.

計劃的總開支為一億円。

Thanks to the development of agricultural science, world food production has managed to keep up with population growth - but only at the expense of the future.

由于农业的发展，食品全球产量能够跟上人口的增长，但只是牺牲了将来。