Tony Jolliffe/ BBC News
The jelly is chemically inert since no additives are needed for gelation. This allows chemicals dissolved in the jelly’s aqueous phase to diffuse well, a prerequisite for testing if certain species or strains are resistant to antibiotics or antifungals. In these simple assays, zones of growth inhibition of bacteria or fungi (or their absence) point to the effectiveness of (or resistance towards) antibiotics or antifungals.
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Purple: Baseball clubs
所以才有了部分网友的吐槽：高价邮轮产品不是买不起，是觉得不值。