Warm-up Question: What are some good and bad things about rain?
1. The smell of rain has a special name: petrichor! Many people appreciate this smell. However, the smell mainly comes from the ground, not the rain.
2. Petrichor is a mix of smells. When the weather is dry, plants make oils and put them in the soil.When it rains, there is a chemical change in these oils. This makes part of the smell of rain.
3. Another smell in petrichor is made by ozone in the air. Lightning makes this during storms.
4. Humans are better at smelling petrichor than animals. We can notice this smell easily, even when it’s faint.
读之前想想看：雨水有哪些好处和坏处？
1. 雨的气味有一个专门的名字：潮土油！许多人认为这种气味很好闻。然而，这种气味主要来自地面，而不是雨水。
2. 潮土油是由多种气味混合而成的。当天气干燥时，植物会制造油脂并释放到土壤中。下雨时，这些油脂会发生化学变化，就成为了雨一部分的气味。
3. 潮土油中的另一种气味由空气中的臭氧生成。闪电在暴风雨期间会产生臭氧。
4. 比起动物，人类对于潮土油的味道更敏锐。即使是微弱的气味，我们也能轻易察觉。
1. appreciate (v.)欣赏
I appreciate the beauty of this beach. I could spend all day here.
我欣赏这个沙滩上的美景。我可以在这里待上一整天。
2. lightning (n.)闪电
The big tree in the park fell down after lightning hit it.
公园里的大树在被闪电击中后倒下了。
3. storm (n.)暴风雨
The table and chairs on my balcony got wet in the storm.
我阳台上的桌椅在暴雨中淋湿了。
4. human (n.)人类
Most wild animals are scared of humans and run away from them.
大多数的野生动物都很害怕人类并会躲避他们。
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