You will hear a lecture. After listening to the lecture, in 10 seconds, please speak into the microphone and retell what you have just heard from the lecture in your own words. You will have 40 seconds to give your response.

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 参考背景: I’m just going to take on the stuff where left off. The hormone I want to now talk about it's called melatonin. The synthesis is in the Pineal Gland, which is very small. It is the size of a pea in your brain. A day car called at the seat of the soul, and it is where melatonin is made. And it has a rhythm as well. And in the sense, it is the opposite of the cortisol. It peaks at night. We call it as the darkness hormone. In every species that we studied, melatonin occurs at night. And it's hormone that prepares you for the things that your species, does at night. So, of course, in humans we sleep, but animals, like rodents, they are awake. It’s hormone that is related to darkness behaviour.