指的工厂防火，这句话，Elevated是什么意思

chgdong213

Elevated floors and platforms that could retain significant
quantities of liquid hydrocarbons should be treated as
though they were on the ground-floor level, for purposes of
calculating vertical distances for fireproofing (see Figure 5).

chgdong213

这句话确实不好理解，尤其是grade level