Sherlock Holmes and the case of the curly haired company

[Ema]

Dear All,

I am reading the "Mandarin Companion" book "Sherlock Holmes and the case og the curly haired company" (level 1). I really cannot make out the structure of a sentence, though. In this scene, Gao Ming (Sherlock Holmes) is makiong a deduction about his guest and says "你看你的左手, 上面有一些伤口, 经常用刀人才会有这样的伤口. 还有, 我去海南, 你手上的这个东西, 只有海南才有."

OK now, the red part is the one I am wrecking my brains on... how would you translate it? I reckon that the general meaning is that something that is on his hands reveals that he has been in Hainan, but I have no clue on the exact translation. What I really don't understand is the construction of 只有海南才有.

Any suggestions?

Thank you everybody!

 

Emanuele

 

[edelweis]

"只有+ noun or phrase + 才 + verb or phrase"  is commonly used to express that "noun or phrase" is a mandatory condition to "verb or phrase"

https://resources.allsetlearning.com/chinese/grammar/Expressing_"only_if"_with_"zhiyou"

exemple sentence from yellowbridge: 只有你才做得到。You're the only one who can do it.

In your book, I think you can also put 你手上的这个东西 at the end, making the phrase 有你手上的这个东西

只有海南才有[你手上的这个东西]

only in Hainan is there what's on your hand.

 

(meaning: what's on your hand is only found in Hainan)

 

[Ema]

Thank you Edelweis, awesome! I didn’t know that structure. Your explanation has been very helpful and very clear indeed!