出自三命汇通论，是算命的一种 吉凶性质：百川水，喜春夏木火。凶伏马，大败，破字，杖刑。
在半岛北部，海拔足够低，因此古玛雅人能够经由被称为竖井的深层排水口或深洞探及地下水位。
In the northern peninsula the elevation is sufficiently low that the ancient Maya were able to reach the water table at deep sinkholes called cenotes, or at deep caves.
在这里游客们可以使用相应的设施进行自由潜水或戴水肺潜水，另外还有供洞穴潜水新手使用的地下水洞。
Visitors are able to use the facilities for free diving and scuba diving, with underwater caves for cave diving beginners.
由于地下水潜蚀、化学溶蚀等作用，灰岩地区溶洞、土洞较为发育，给桩基施工带来较大困难。
By the action of groundwater erosion and chemolysis, cavities are well developed in limestone area, which causes many problems for pile foundation construction.
应用推荐