Refurbished means restored - made better, and to retighten, is simply to tighten again.

味着恢复——变得更好，而重拧紧，就是再次拧紧。

The three words were: recycled, refurbished and retighten.

这三个词是：回收、和重收紧。

We looked before at the word 'retighten', which means 'to tighten again'.

我们之前看过“retighten”这个词，思是“再次收紧”。