be worth這個詞用法比較特別的.（屬于及物動詞范疇）
1.be worth+vt-ing表示值得被做（v-ing是及物動詞,但不加賓語的）
如：
The book is worth reading.
2.be worth+錢數(shù)
The book is worth 20 yuan.
3.be worth+n(the trouble/it/a visit)等
I am spending a lot of money and time on this boat,but it is worth it?
我正把大量的金錢和時間花在這艘船上,但這樣做值得嗎?
This restaurant is well worth a visit.
這家飯店很值得光顧.
Is it worth all the trouble?
那件事值得那樣費神嗎?
the trouble是特指前面的麻煩,所以,加the