用法透视
这里的"负担"多指金钱，但也可以指精神或状况。

支持范例
1. I can't afford to be absent from school.
我不能不上学。
2. I can't afford to go away three weeks from work.
我可不能三个星期不上班。
3. I can't afford to take any risk.
我不能冒任何风险。

会话记忆
A: We're going out to dinner and then to the movies.
晚餐出去吃，然后去看电影吧。
B: Hold on! I can't afford to pay for both.
等一下！我无法同时付这两笔钱。
A: Don't worry. I've got money. It's my treat.
别担心，我有钱。我请你。
B: Gee, that's really nice of you.
啊！你真好！