1·Citric acid can be extracted from the juice of oranges, lemons, limes or grapefruit.
柠檬酸可以从橙汁、柠檬汁、酸橙汁或柚子汁中提取。
—— 《柯林斯英汉双解大词典》
2·The fun is all about expression people make as all that citric acid hits their taste buds.
有趣的是，当所有的柠檬酸冲击他们的味蕾时，人们做出的各种表情。
3·The clock derives its energy from electrolysis of the citric acid and this helps you leave those toxic batteries away.
这种时钟可以从柠檬酸的电解过程中获取能量，这样你就不需要用那些有害的电池了。
4·McDonald's French fries, for example, which have repeatedly proven their hardiness to spoilage, contain citric acid as a preservative.
麦当劳那些多次被证实能抗腐烂的薯条，含有柠檬酸作为防腐剂。
5·And they wanted to use a soluble salt of citric acid, so they could have used sodium, they could have used potassium.
而且他们想用一种柠檬酸的可溶性盐，他们本可以用钠，也可以用钾。