肝的生物转化反应之一是硫酸结合反应，3-磷酸腺苷-5-磷酸硫酸(PAPS)是活性硫酸的供体，在转硫酸酶催化下，醇、酚类物质与硫酸结合成硫酸酯。这是一种常见的结合反应。
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N-UNCOUNT If you describe something such as information, writing, or entertainment as pap, you mean that you consider it to be of no worth, value, or serious interest. 胡言乱语; 无益的娱乐 [表不满]
N-UNCOUNT Pap is food that has been mashed or made soft so that it is suitable for babies and very old people. 流食
He finally had a little pap and looks like he's going to sleep.
他最后吃了些流食，而且看起来要睡觉了。
N a nipple or teat 奶头 [SCOTTISH] [DIALECT]
V (of the paparazzi) to follow and photograph (a famous person) (狗仔队)跟踪拍摄
词组短语
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