The researchers also examined sediment samples from the sunken world and found traces of pollen and coal, suggesting land plants once resided there.
研究者们也检查了从沉没岛屿里采集的沉淀物样本发现了花粉和碳，表明岛屿上曾经有过植物生长。
The optimum design can be selected through comparing sunken tank - above - ground pump, sunken tank - submerged pump and land tank - above - ground pump.
重点对地下罐—地面泵、地下罐—潜液泵、地面罐—地面泵几种工艺进行了分析比较，指出应根据实地情况确定合理的设计方案。
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