通过这篇播客，我们知道了有一些动物它进化成黑白相间的样子是有些原因的。但绝不是单一的原因造成的。比如说斑马它的黑白相间的颜色可以让蚊虫产生视觉上的错觉，而不再叮咬它。比如说熊猫它黑白相间的颜色可以很好的隐藏，不被捕猎者发现。

Nina的碎碎念

为什么有些动物是黑白相间的？

      duì bu qǐ 
A：对不起！
     méi ɡuān xi
B：没  关  系！


HSK Standard Course Level 1 Audio of the textbook

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https://drive.google.com/file/d/1mNZx1uRWNIr4FgAD4zw2a2IgHLl7u80V/view?usp=drivesdk

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Learn Spanish Conversation parte 9

It might sound like the worst start to your day — you get into the shower, and it's ice cold. But while you might not enjoy it, a cold shower could actually be good for your health.

Spending time in cold water is not a new idea — the Ancient Greeks used cold water as a form of therapy as early as 3,500 BC. And things like cold water swims and ice baths have become quite popular around the world.

Experts believe there are a few reasons cold showers could be good for us.

Corey Simon, a doctor at Duke School of Medicine in the US, told CNN that having one or two cold showers a week helps him be more mentally present.

He believes the reason for this is that he has to mentally prepare himself for something stressful: the cold water. But once he's in it, he feels like he's in control of that stressor.

In fact, a 2022 study found that participants who showered for a minute in 10- to 14-degree water every day for two weeks had lower stress levels than a control group.

Cold showers could also be good for our immune system. In a study done in the Netherlands in 2016, people who spent 30 to 90 seconds in a cold shower took 29% fewer sick days from work.

Cold water has also been found to improve circulation, and can reduce muscle pain after a workout. Research suggests that taking a cold shower often could increase your metabolism too.

But experts say it's important to speak to your doctor before taking cold showers often, because it could be dangerous — especially for those with certain conditions, like heart or circulatory problems.



Practice Listening, Reading & Comprehension

Why Cold Showers Could Be Good for You

Australia to set Minimum Age for Social Media 