worth与worth of的用法

老师好，下面句子里，

Huge progress has been made against these diseases since an agreement in 2012 by pharmaceutical firms to donate billions of dollars’ worth of drugs.

“billions of dollars’ worth of drugs”为什么要加worth of？直接说 billions of dollars’ drugs不行么？

谢谢老师。

(1) 主语+系动词be+worth+名词（worth为形容词用法，意思值..钱）

One of the pictures is worth £50,000.

其中一幅画值5万英镑。

The contract was worth £25 million a year.

这份合同一年价值2,500万英镑。

(2)名词's worth of +名词（为名词用法，意思价值为...的某物）

I went and bought about six dollars' worth of potato chips

我去买了大约6美元的薯条。

You've got three years' worth of research money to do what you want with.你有可维持3年的研究经费去做自己想做的事

陈才 - 英语教师

擅长：中考英语,词法问题 | 采纳率 28% | 回答于 1秒前

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凡哥英语 - 海归英语教师 1秒前

擅长：英语

表达的意思略有不同：

1）The MP3 is worth at least $10.

这台MP3至少值10美元。（这里worth的用法同介词）

2）I bought about ten dollars' worth of MP3.

我买了一台价值约10美元的MP3.

worth of sth 表示“价值多少多少的（物品）”，其套用格式是：

金额's worth of sth.