GbEng
石油化学制品从石油或天然气中提炼出的化学产品 A chemical derived from petroleum or natural gas.
石油化工产品现在已占所有化学制品的四分之一，十年后预计这个数目还要加倍。 Petrochemicals today account for one fourth of all the chemicals made, in ten years this amount is expected to double.
我不愿意牵扯到这场学制改革的争论之中。 I don't want to get sucked into the row about school reform.
陶瓷学制作陶瓷物品的工艺或技术，尤指用耐火粘土制 The art or technique of making objects of ceramic, especially from fired clay.