这水下的墙壁上都长满了青苔(tái ),而且越往(wǎng )下,这直径就(jiù )越宽敞。这口锁龙(lóng )井竟(jìng )然是跟沙漏一(yī )样,上(shàng )面小,但(dàn )越往下面(miàn )游(yóu ),就越大。很(hěn )快,我就游到了井底(dǐ )。井底四周都是用(yòng )石(shí )头盖(gài )成(chéng ),光滑无比,而这底下并(bìng )没有什(shí )么铁链。而上面落下(xià )来的七条锁(suǒ )链到井底后,竟然全部往一个高两(liǎng )米(mǐ ),宽三米(mǐ )山(shān )洞模(mó )样的洞穴里面延伸而(ér )去。我心里疑(yí )惑起来,