The lecture is (mainly) about ~
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The lecture is mainly about how forest fires are beneficial to the forests.
The topic of the lecture is ~
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The topic of the lecture is the cause of the great extinction of the dinosaurs
The professor talks about ~
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The professor talks about two different reactions children have when given rewards.
According to the lecture/professor, ~ is ~
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According to the professor, the Acacia species of tree is one that is harmful to other trees and plants in the forest.
Explaining the Details
(1) Talking about Subtopics
The professor says there are two main ways ~
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The professor says there are two main ways that forest fires benefit the forest.
The first (one) is ~, and the second (one) is ~
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The first one is that the heat from the fires helps trees release seeds, and the second one is they help rejuvenate the forest floor with nutrients.
According to the professor, there are two types/kinds of ~
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According to the professor, there are two types of reactions kids have when given rewards.
One is ~, and the other is ~
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One is positive, and the other is negative.
(2) Talking about Examples
The professor gives two examples of ~
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The professor gives two examples of how a large meteor that struck the earth could have caused the extinction of dinosaurs.
The professor talks/speaks about ~ as an example of ~
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The professor talks about the abundance of male dinosaurs being born as an example of how reptile eggs are sensitive to high temperatures.
The professor gives one more example that shows ~
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The professor gives one more example that shows how seeds are released from a pine cone only when there is enough heat.
