塑料燃燒時產(chǎn)生出危險的副產(chǎn)品。When burnt, plastic produces dangerous by-products.醫(yī)學(xué)研究引出的有商業(yè)價值的副產(chǎn)品commercial spin-offs from medical research糖及其副產(chǎn)品是這個島國經(jīng)濟的基礎(chǔ).Sugar and its byproduct are the basis of the island's economy....