（三）案件情况疑难复杂、涉及多个法律关系的。
需要索引（如算距离、下标）：栈存索引，用 nums[stack.at(-1)] 取值比较。
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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.