But citric acid lowers the pH in that tissue, which makes the enzyme unable to function.

但是柠檬酸会降低该组织的酸碱度，从而使酶无法发挥作。

That alkalinity drops, however, as the concrete cures.

然而，随着混凝土固化，碱度会下降。

The high alkalinity of uncured cement stops the moisture activating the spores.

未固化水泥的高碱度阻止水分激活孢子。

Homeostasis refers to a system's ability to regulate its internal environment and maintain a constant condition of properties like temperature or pH.

内稳态是指一个系统调节自身内部系统的能力并维持其属性在一个常规的状态下就好温度或酸碱度。

And natural rain’s pH is about 5.6; it’s slightly acidic from mixing with carbon dioxide in the atmosphere.

而自然雨水的酸碱度约为5.6； 与大气中的二氧化碳混合后呈弱酸性。

The amount of carbon dioxide that is exhaled is important in regulating the acidity or alkalinity of the blood.

呼的二氧化碳量对于调节血液的酸度或碱度是重要的。

Acid rain can be surprisingly acidic: Some samples have been comparable to vinegar, or even stomach acid, with a pH of around 1.5.

酸雨的酸性料：一些样品的酸碱度约为 1.5，甚至与醋甚至胃酸相当。

As he went, despite the stream of merry chatter about the relative merits of waterproof fabrics, or the perfect pH of beer, he was on the watch.

尽管他生前开过许多关于防水织物相对优点，啤酒最佳酸碱度的玩笑，但他走后还是守望着这些大山。

At the same time, the secretion of gastrin is activated by other signals, like the rise in alkalinity caused by the stomach acid getting neutralized as it does its job.

与此同时，胃泌素的分泌被其他信号激活，比如胃酸在发挥作时被中和引起的碱度上升。

But it also helps regulate and maintain body temperature, pH levels, and the volume of fluids in your body. Plus it protects you from infection and from the loss of blood itself.

但它也有助于调节和维持体温、酸碱度和体内液体的体积。此外，它可以保护你免受感染和血液本身的流失。

Your internal balance between oxygen and carbon dioxide factors heavily into all sorts of stuff — especially in your blood, where it can affect your blood's pressure, its pH level, even its temperature.

你体内氧气和二氧化碳之间的平衡对各种物质都有很大影响——尤其是在你的血液中，它会影响你的血压，它的酸碱度，甚至温度。

Calcium, magnesium, and phosphorus harden bones and teeth, while iron is, of course, crucial in hemoglobin. Plus, potassium, sodium, and chlorine help maintain your body's pH balance and are used in action potentials.

钙、镁和磷使骨骼和牙齿变硬，而铁当然对血红蛋白至关重要。此外，钾、钠和氯有助于维持身体的酸碱度平衡，并于动作电位。