买不起;负担不起

If you can't afford a new copy, perhaps you can find a second hand copy.
如果你买不起新书, 你或许可以买到一本旧的.
来源:《现代汉英综合大词典》A new car would be wonderful but the fact of the matter is that we can't afford one.
有新车好是好,不过实际情况是我们买不起。
来源:《牛津高阶英汉双解词典》People who can't afford to go to the theatre or concerts can afford to go to football matches
看不起电影或听不起音乐会的人可以去观看足球赛。
来源:柯林斯高阶英汉双解学习词典Don't let credit tempt you to buy something you can't afford
不要因为可以赊购,就买超过自己支付能力的东西。
来源:柯林斯高阶英汉双解学习词典We aren't too badly off but we can't afford a house like that.
我们并不是一文不名,但我们负担不起那样的房子。
来源:《牛津高阶英汉双解词典》微语录 · 经典语录

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