You smell the fragrance, you know how to appreciate, but you can not afford.

你是闻得到芬芳的人，你懂得欣赏，但你无力承担。

youdao

You should rein in your expenses unless you can not afford the expensive car.

你应该严加控制自己的开支，否则你买不起昂贵的小轿车了。

youdao

The profit margins on most businesses are so small that you can not afford for those funds to go towards paying off debt.

大部分行业利润率都太小了以至于你甚至不能偿清债务。

youdao

If you can not afford to buy outright, it takes a year to qualify for financing in Dubai.

BBC: Living in: Dubai

As for the veggies, I suppose such forced feeding would indeed be an invasion of personal liberty, but making you pay for them would not, just as making you pay for a gym membership which you can afford but do not use would not.

FORBES: Harvard Law's Fried: A Broccoli Mandate is Constitutional

But, the real question is: Can you afford not to tweet ?

FORBES: Is Twitter a Colossal Waste of Time?