除了这些，被拖稿、查重不过、收了钱却交不上程序、代写水平差、写完了就人间蒸发不管售后等等等等，都是特容易掉进去的陷阱。 Customer and producer surplus are both equally labelled to the diagram. Purchaser surplus is identified above the equilibrium line, and is the world or surplus of what individuals need to shell out and the things they are ready to spend. 三分钟即可完成下单，支持多种格... https://royalbookmarking.com/story12761655/what-does-%E7%BE%8E%E5%9B%BDessay%E4%BB%A3%E5%86%99-mean