是in the north 还是 in north ?如果是 in the north,那么go up north为什么

是in the north 还是 in north ?如果是 in the north,那么go up north为什么 是in the north还是 in north in the north还是in north 正确的语法是in the north,on the north,还是at the north in the north lie in the north north of 和in the north of 是It's in north of China.还是It's in the north of China We go up north.We play in the snow. Water city in the North in the north of England in North 和 in the North 有什么区别