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Hi Susan,
Thank you very very much for your great help. Your answers always help me a lot.

Quote susan53

Similarly, imagine a naturalist talking about forests in country X :

Of course, the forests here are famous for their bears - there are more here than anywhere else in the world. And wolves too. Forests X, Y and Z have a lot of wolves - so many that you have to be careful when you're travelling there.

He's saying that, in this case, wolves are an "integral and unsurprising" component of these forests - whether they are elsewhere is unimportant because the context specifies that the general situation is unimportant. you could have achieved much the same effect in your sentence just by changing The to This...
This forest has a lot of wolves - so be careful when you travel there.

What do you mean by the general situation is unimportant.

I don't understand why [you could have achieved much the same effect in your sentence just by changing The to This...
This forest has a lot of wolves - so be careful when you travel there]. So could you please explain it?

Is it possible that we can use these sentences in the right context?

1."The fridge/box has some apples in it.
2."My soup has a fly in it. Can you give me another one?"
3."How many people does your class have?"
4.My desk has a computer on it. You can use it if you want."