Indexes typically speed up queries, sometimes reducing the time required to execute the query to a fraction of the former elapsed time.
索引很好地加快了查询地速度，有时将执行的时间减少到以前占用时间的一小部分。
Aryl isoprenoid compounds in the aromatic fraction of sedimentary organic matter have been regarded as a biomarker that indicates a saline and strongly reducing sedimentary environment.
芳基类异戊二烯化合物被认为是高盐和强还原沉积环境中沉积有机质芳烃馏分中的特征性生物标志物。
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