xiāo / huà / gān / yóu / shì / yì / zhǒng / xū / yào / jǐn / shèn / bǎo / cún / de / huà / xué / wù / zhì

硝化甘油是一种需要谨慎保存的化学物质。

Nitroglycerine is a chemical substance that must be stored carefully.