"Sewage oil" could be the waste cooking oil gathered by unethical retailers from squander bins or sewers and then processed and bought incredibly cheaply to little eating places as cooking oil. even though it is unethical and harmful, it is rather prevalent in many aspects of China. 建議大家找論文家教的老師時，一開始的免費諮詢就直接問諮詢教授比較深的問題，例如：對題目的建議、走向任何... http://alexisuoco5.total-blog.com/an-overview-36869751