So you take something like this, you burn it, you put it under pressure, and likely as not, you get this. Although, again, I stress: we don't know.
그래서 식물을 태운다음에, 압력을 받게 하면 아마 이런 석탄을 얻게 될 겁니다. 물론 정확하게는 알 수 없지만요.