I preserved in a one percent solution of polyvinyl acetal resin.

我把它保存在纯净的 聚乙烯醇缩醛树脂里了。

This 5 percent solution of hydrochloric acid is changing the mass of this carbonate mineral by negative one billionth grams per minute.

这种 5% 的盐酸溶液每分钟将这种碳酸盐矿物的质量改变负十亿分之一克。