Luan Lu á n: 1. Small and sharp mountains, 2. Connected mountains.
1 mountains: continuous mountains.
2 hills: one after another, with ups and downs.
three layers of mountains: continuous peaks.
4 Luanshan: the mountain with small Erjian.
Sentence:
1 Mountains: The mountains in the distance are faintly visible.
hills: in this area, there are hills and hills everywhere.
3 layers of mountains: along the way, we enjoyed the distant mountains with many layers of mountains.