zài / zhè / ge / gōng / shì / zhōng / fāng / kuò / hào / biǎo / shì / lǐ / miàn / de / nèi / róng / xū / yào / xiān / jì / suàn在这个公式中,方括号表示里面的内容需要先计算。In this formula, square brackets indicate that the content inside them should be calculated first.