You might have mixed feelings about rain.
你可能对雨有复杂的感觉。
For those experiencing long periods of drought, rain can bring joy.
对于经历长期干旱的人来说，雨水可以带来喜悦。
But for those wanting to enjoy the outdoors, a large downpour can ruin the experience.
但对于那些想要享受户外活动的人来说，一场大雨可能会破坏体验。
Getting drenched by the weather can make you feel cold and weaken your immune system, but there are some surprising benefits to going out in the rain, provided you've got your brolly and raincoat!
被雨淋湿会让你感到寒冷并削弱免疫系统，但只要你带了雨伞和雨衣，走出雨中也有一些意想不到的好处。
Have you ever noticed a difference in the smell in the air after it's rained?
你是否注意到雨后空气中有一种不同的气味？
That smell has a name – petrichor.
这种气味有一个名字——petrichor（潮土油）。
This earthy scent, a pleasant one to many, happens when raindrops release particles from the ground.
这种泥土的气息，对许多人来说是令人愉快的，发生在雨滴释放地面的颗粒时。
Humans are incredibly sensitive to the smell, which some scientists think is because it tells us there is new, fresh water.
人类对这种气味极其敏感，一些科学家认为这是因为它告诉我们有新的淡水存在。
It probably made our ancestors feel safe and calm.
它可能让我们的祖先感到安全和宁静。
And then there's the relaxing sound of raindrops splattering on a hard surface.
还有雨滴溅落在坚硬表面上的放松声音。
A 2018 study published in PubMed Central by Thoma and colleagues found that the sound of rain can reduce the stress hormone cortisol and bring a sense of calm.
2018年Thoma及其同事发表在PubMed Central上的一项研究发现，雨声可以降低压力激素皮质醇，带来平静感。
When raindrops hit a hard surface, something called 'negative ions' are released into the air, which, when in high levels, are known to boost serotonin in the brain, again making us feel more relaxed.
当雨滴撞击坚硬表面时，一种称为“负离子”的物质被释放到空气中，高浓度的负离子已知能提高大脑中的血清素水平，再次让我们感到更加放松。
However, there isn't a scientific consensus about exactly how this is happening.
然而，科学界对于这具体是如何发生的还没有达成共识。
These negative ions also make the air cleaner.
这些负离子也使空气更清洁。
Pam Dalton, a cognitive scientist at the Monell Chemical Senses Center in Pennsylvania, says there is reasonably good evidence that 'the negative ions can clear dust, bacteria, allergens, and other particles from air, which for many can have a positive effect on respiratory health.'
宾夕法尼亚州莫奈尔化学感官中心的认知科学家帕姆·道尔顿说，有相当好的证据表明“负离子可以清除空气中的灰尘、细菌、过敏原和其他颗粒，这对许多人的呼吸健康有积极影响。”
The heavier the rain, the greater effect it has on cleaning the air.
雨越大，对空气的清洁效果越强。
You could feel some of these benefits from the comfort of your own home, just by opening the window and taking a whiff of the petrichor scent or listening to the pitter-patter sound on your roof.
你可以在舒适的家中感受到其中一些好处，只需打开窗户闻一闻petrichor的气味，或聆听屋顶上滴答的声音。
Or, after making sure you're dressed in the right attire, step outside in the rain to fully experience the mood-boosting effects of those mysterious negative ions in the air.
或者，在确保你穿着合适的衣服后，到雨中走走，充分体验空气中那些神秘负离子的提神效果。
Just remember to come straight back inside if you see lightning, as this could be dangerous.
只要记住，如果看到闪电，立即回到室内，因为这可能很危险。
