它们通常由地下泉水供养，其中许多流自石灰岩山丘，如摩洛哥的阿特拉斯山脉。
These are generally fed by groundwater springs, and many issued from limestone massifs, such as the Atlas Mountains in Morocco.
由于像如砂岩和砾岩这样的沉积岩是多孔的，它们是地下水的重要潜在来源。
Because they are porous, sedimentary rocks, such as sandstones and conglomerates, are important potential sources of groundwater.
北岩品牌很幸运存活下来（其他倒闭的银行，如Alliance&Leicester和Bradford&Bingley被对手兼并）。
The Northern Rock brand was lucky to survive (banks which failed later, such as Alliance & Leicester and Bradford & Bingley, were absorbed by rivals).
应用推荐