其机制可能是，细胞巯基耗竭，使鸟苷酸环化酶活性降低，致血管平滑肌松弛作用减弱。
The mechanism is probably that the consumption of cell mercapto lowers the activity of guanylate cyclase, thus weakening the slackness of blood vessel's smooth muscles.
抗高血压药物常常会激活某些反馈机制，导致其降压作用的减弱。
The blood pressure-decreasing effect of antihypertensive drugs is often blunted because of the activation of feedback mechanisms.
试验的三种透水率桩坝，其导流效果与实体丁坝群的基本相同，并未因部分透水及形态不同而使其控导作用明显减弱。
Three kinds of permeable pile dikes with different seepage rate are tested, and effect of flow control is basically the same with the spur dike,.
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