求翻译：5．The researchers combined gentamicin with different kinds of sugars, including mannitol, fructose and glucose. (Sucrose, the stuff you put in your coffee, is just one of many types of sugars as far as biochemistry's concerned.) When the scientists added these sweetened antibiotics to bacteria grown in Petri dishes, it killed over 99% of the bacterial persisters. The type of sugar seemed to make a difference, as well; only fructose helped the drug kill S. aureus, for instance.是什么意思？

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