《徐霞客游记·滇游日记三十一》
所以双乳峰之前，左右都有中间下洼的山坳，中峰之后，左右也有峡谷锁闭着中峰，它的脉理好似非常平缓，但一起一伏的，隐约可以探寻。
故两乳之前，左右俱有洼中坳，中峰之后，左右亦有峡中扃，其脉若甚平，而一起一伏，隐然可寻。
Therefore, there are mountain passes between the double breasts and the middle is lower, and there are canyons between the middle peaks and the middle peaks are closed. Its pulse seems to be very gentle, but it can be found vaguely.
<s>[INST] Identify the key themes in this Classical Chinese text and explain them in English: 故两乳之前，左右俱有洼中坳，中峰之后，左右亦有峡中扃，其脉若甚平，而一起一伏，隐然可寻。 [/INST] Therefore, there are mountain passes between the double breasts and the middle is lower, and there are canyons between the middle peaks and the middle peaks are closed. Its pulse seems to be very gentle, but it can be found vaguely.</s>
Identify the key themes in this Classical Chinese text and explain them in English: 故两乳之前，左右俱有洼中坳，中峰之后，左右亦有峡中扃，其脉若甚平，而一起一伏，隐然可寻。
user
Therefore, there are mountain passes between the double breasts and the middle is lower, and there are canyons between the middle peaks and the middle peaks are closed. Its pulse seems to be very gentle, but it can be found vaguely.
assistant