1樓：好鬱悶起個名字
意思：第二產業；乙類工業；第二級行業。
相關短語：
primary, secondary and tertiary industries 第
一、二、三產業
china's secondary and tertiary industries in gdp 第
二、三產業生產總值
相關短語：
secondary industries include the mining, manufacturing and power sectors; tertiary industries cover services.
第二產業包括採礦業、製造業和能源業；第三產業則包括服務業。
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