It's used to determine the acidity or alkalinity of something.

它用于确定某物。

Like, I learned that the p in pH doesn't stand for anything.

比如说，我了解到中 p 并不代表任何东西。

Basicity and alkalinity are kind of often used interchangeably.

和性常常可以互换使用。

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能力并维持其属性在一个常规状态下就好像温。

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

而自然雨水约为5.6； 与大气中二氧化碳混合后呈弱性。

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

呼出二氧化碳量对于调节血液是重要。

Boch and Barry are putting the eggs and sperm together in water with varying levels of acidity to examine how it affects fertilization.

博奇和巴里将卵子和精子放在不同水中混合，以观察这如何影响受精。

Pretty Litter helps monitor your cat's health by testing acidity and alkalinity levels and the visible presence of blood in your cat's urine.

Pretty Litter 能通过检测猫咪尿液以及肉眼可见血迹，来帮助监测猫咪健康状况。

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

雨性出人意料：一些样品约为 1.5，甚至与醋甚至胃相当。

Maybe what we saw in the last experiment, where fertilization was lower in low pH, maybe it's because the sperm are not swimming as fast.

也许我们在上一个实验中看到情况，即在低环境下受精率较低，可能是因为精子游动得不够快。

There are just too many unknowns, as researchers are still working out the precise temperature, precipitation, elevation, soil pH, and other environmental factors that determine a truffle orchard's success.

未知因素实在太多；研究人员仍在破解温、降水、海拔、土壤等决定松露园成败关键环境参数。

The dance of the breath balances the pH of our bodies and influences our hormones, nerves, and blood vessels, but also our thoughts, feelings, and emotions.

呼吸律动不仅平衡我们体内，影响激素、神经和血管，还牵动着我们思绪、情感与情绪。

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，胃泌素分泌被其他信号激活，比如胃在发挥作用时被中和引起上升。

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、和体内液体体积。此外，它可以保护你免受感染和血液本身流失。

You know, the acidity of the soil, as you know, you're a farmer, acidity of the soil is one of the main things you check other than moisture content.

你知道，土壤，作为农民，你知道，除了水分含量之外，土壤是你需要检查主要事项之一。

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平衡，并用于动作电位。

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平衡对各种物质都有很大影响——尤其是在你血液中，它会影响你血压，它，甚至温。

Beyond pressure and temperature, the researchers are also experimenting with biodegradable sensors that measure acceleration, acidity, and fluid flow -- all useful things to know about a brain that’s just been knocked around.

除了压力和温，研究人员还在试验可生物降解传感器， 用来测量加速、和流体流动——这些都是了解刚刚遭受撞击大脑非常有用信息。