Best Moments From IShowSpeed In Mongolia,China. Here " In Mongolia,China" means Mongolia belongs to China? or this expression is like In Mongolia and China.

This began to change in the 1840s,among the pool factors were the young country's industrialization and western expansion. Here "the pool factors",what does that mean?

That's the spirit. and You have nailed it. Are they slang？Is it often used by native speaker？

It is about people who love their country too much to do anything less than their best. Pls help explain above sentence of structure. I could kind of guess what it means,but I am not very clear about "do anything less than their best"

You are in net force for good if you want to be. No one is perfect. What does that mean?

1. Bed room is a place that your body and mind associate with sleep. 2. Bed room is a place that your body and mind link to sleep. Are these sentences same? Can the two be interchangeable "link to" and "associate with"

"My friends don't know my dad that well to compare me to him all the time" How do I understand this sentence? My friends won't compare me to my dad,or My friends will compare me to my dad?

1. I am somewhat pessimistic about economy in next year. 2. I am somehow pessimistic about economy in next year. Are the two sentences natural ?

She had always wanted to try Spanish food. So last Sunday was a chance, and we were all set to go. (we were good to go) Which is natural and right in above sentence? We were all set to go and We were good to go.