It's nice and warm sitting by the fire为什么用sitting

问题描述:

It's nice and warm sitting by the fire为什么用sitting
坐在炉边,“坐”不是动词吗?

sitting在此为名词,意思为.坐,就座,入席.
整句话的意思为:坐在火炉边既温暖又美妙.