對，還一個原因是那些石灰岩比較特別，既容易鑿洞，又不會輕易坍塌，還有冬暖夏涼的保溫隔熱效應。。

來源: Helvetia 於 2024-05-20 15:18:35 [舊帖] [給我悄悄話] 本文已被閱讀：次

WENXUECITY.COM does not represent or guarantee the truthfulness, accuracy, or reliability of any of communications posted by other users.