核心问题
（a）I could do with a cup of tea.
(b) The car could do with a good polish.
(c) Some children can do with very little spending money.
could do with 按字面很难理解其含义。请解释。
词典解答
在句(a)中 could do with 是“想要”(want)的意思，在句(b)中是需要(need)的意思，而在句(c)中则是“有……就行了”“有……就可以了”。请看下面的例句及其译法：
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I think we could all do with a good night's sleep... (EED) 我认为我们大家都需要好好地睡一夜……
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Your hands look as though they could do with a wash. (Wood) 你的两只手看样子需要洗一洗。