worth 与 worthwhile 虽然后均可接doing,但还是有些区别的；
worthwhile 相当于worth while,这样代入句中可有效判断其与worth的区别.
The problem is worth considering.(不用worthwhile)
It is worth considering the problem.(可换用worthwhile)
另外,worthwhile可直接作形容词表语,而worth不行,只可be worth doing短语
Considering the problem is worth while (不用worth)
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