n.鐘乳石
Not every stalactite has a complementary stalagmite. 不是每根鐘乳石都有互生的石筍。
You can calculate, how long will it take for the stalactite of such type to grow. 請諸位算一算，這么大的鐘乳石得需要多少個(gè)漫長的歲月啊！
n.石鐘乳
