"Sewage oil" would be the waste cooking oil collected by unethical merchants from waste bins or sewers and then processed and sold pretty cheaply to small eating places as cooking oil. although it is unethical and harmful, it is quite prevalent in several areas of China. 曾經也有類似被騙經驗 論文指導...想都別想還是靠自己找指導教授談...之前在某家設立已久的老店...但是也是為了儘早畢業...... https://johnnyrtpk7.illawiki.com/2318929/detailed_notes_on_論文代寫推薦