请为我解释一下几个英文语句.
I feel it's a great honor to kind of wind up this extraordinary gathering of people -- these amazing talks that we've had.（“kind of wind up ”是啥意思?）
I came directly here from the deep,deep tropical rainforest in Ecuador,where I was out（为啥要was而不用am?）
They know mental as well as physical suffering.（mental在此句中是啥意思?）
we're already in 60-plus countries（此句中的plus是啥意思?）
If we lead lives where we consciously leave the lightest possible ecological footprints…we can change the world overnight.（ lightest possible ecological footprints是啥意思?）