说起岩洞探险，当然要数桂林和重庆的岩洞最有名了。不过都已经开发得差不多了，而且游客又多，谈不上什么探险。
shuōqǐ yándòng tànxiǎn ，dāngrán yào shǔ Guìlín hé Chóngqìng de yándòng zuì yǒumíng le 。bùguò dōu yǐjīng kāifā de chàbuduō le ，érqiě yóukè yòu duō ，tánbushàng shénme tànxiǎn 。
If it's spelunking, of course Guilin and Chongqing rank the most famous. But they're all more or less totally developed, and there are lots of tourists, so you can't call it exploring.