他买不起房子。

He could not afford to buy a house.

《柯林斯英汉双解大词典》

靠自己的工资他买不起奢侈的食品。

He could not afford luxury food on his pay.

youdao

这些房子太贵了，他买不起。

The houses are so expensive that he can't afford to buy one.

youdao

So Kurt Russell and his friends attend a small private college, which cannot afford to buy a computer.

所以Kurt，Russell和他的朋友,参加了一个小的私立学院，那里买不起一台电脑。

哈佛公开课 - 计算机科学课程节选