Different volume fractions of propolis extracted with alcohol and citric acid were used to make solution for queen larvae preservation test.
采用不同体积分数的蜂胶乙醇提取物和柠檬酸配制成保鲜液，进行蜂王幼虫保鲜试验。
Liu also said the excavation will test preservation technology that the museum has spent decades developing to keep the undiscovered terracotta figures intact and retain their original colors.
刘占成还说，此次挖掘工作对目前的保存技术也是一大考验。 数十年来，西博一直致力于研究如何才能使未出土的兵马俑完好无损，确保它们能够维持原色。
The aim of the study was to test a new preservation solution containing polyethylene glycol s.
该研究的目的在于测试一种全新的包含聚乙二醇的保存液S。
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