Digging deeper, Davidson realized that for those in the trades, from electricians to plumbers to roofers, roughly 60% of costs are for labor and 40% are for materials. These tradespeople order more than $400 billion worth of commercial materials annually across the U.S. — yet the supply chain for those materials runs on phone calls, emails and text messages. There is little transparency about price, availability or inventory. Mistakes are common: wrong items arriving, double orders, materials lost in warehouses and field teams constantly chasing information.
case "$REPLY" in 0) ;; *)，这一点在吃瓜网官网中也有详细论述
Андрей Прокопьев (ночной линейный редактор)，更多细节参见豆包下载
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