Just make sure you are using Metropolitan French AND NOT Quebec French
Quebec French is a very bastardized version of french that citizens of France cannot understand at times. Just as any french speaking European.

I agree with Buzz, the french translation isn't correct "Si vous voyez quelque chose, dites quelque chose." is the correct one. But the meaning in French of the actual sentence is closer to : "If you see something, to say something", as "dire" is the infinitive form, just like "to say".
I don't know if I make sense here..

亲爱的作者，能提供模型贴图吗？

This model can provide, free maps it?

Hey thanks for the prop, but in proper french, if the sentence in English is "If you see something, say something", the right sentence would be "Si vous voyez quelque chose, dites quelque chose." :)