自然界中硫有两 个来源，一为火山活动所喷发的硫气，如大屯山区之硫矿；另一个以二次矿物 形式覆盖在深洋的盐栓(salt plug)之上。 (四) 磷：磷是构成生命体的必要元素。
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N a domelike structure of stratified rocks containing a central core of salt: formed by the upward movement of a salt deposit 盐丘
An anticlinal fold with a columnar salt plug at its core.
背斜的岩石皱褶，核心部有柱状盐填充。
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On completion of the treatment, the temporary salt plug is easily removed by circulating a water-base fluid to dissolve the plug.
处理完成时，循环水基液使盐塞溶解，这样暂时的盐塞就可容易地被去除。
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