这(zhè )水(shuǐ )下的墙壁(bì )上都(dōu )长满了青(qīng )苔,而且越往下,这直径就越宽敞。这口(kǒu )锁龙(lóng )井竟(jìng )然是跟沙漏一样,上面(miàn )小,但越往下(xià )面游,就(jiù )越(yuè )大。很快,我(wǒ )就游到了井底。井(jǐng )底四周都(dōu )是用(yòng )石头盖成,光(guāng )滑无比,而这底下并(bìng )没(méi )有什么(me )铁链。而(ér )上(shàng )面落下来的七条锁链到(dào )井底(dǐ )后,竟然全部(bù )往一(yī )个高两米,宽三米山洞(dòng )模样的洞穴里面延伸而去。我心里(lǐ )疑惑起来,