Autumn banquet stone boat pavilion. What does this poem mean?

Song Shushan, Autumn Banquet, Shizhou Pavilion

Jade hand looking for five mountains, just don't know the coastal mainland.

The flowers and trees on the railing are uneven, so go to the next tour on the other side.

Yanji suspected that it was nine Feng Xiao, and she won by peaceful means.

Sitting on the opposite side of the road of the world of mortals, Xianfeng also made Danqing doubt this state.