salt bed的用法和樣例：
例句
- But they lie far underground, below deep waters and a thick, drill-foiling layer of salt.
但是這些油田埋藏在很深的地方，不僅有很深的海水，還有一層厚厚的難以鉆透的鹽層阻隔。 - It has been proved that dual com bined casing used in salt rock and other strata are reliable for preventing the casing from collapsing.
實(shí)踐表明，雙層組合套管在鹽層段和其它特殊層段的應用，對預防套管損壞是切實(shí)可行的。
