When fitted, the inner bottom also makes a significant contribution to the strength of the lower flange. It usually forms a tank boundary（边界） for the double bottom tanks and is subject to the local pressure of the liquid contained therein. In addition, if must support the load from above, usually from cargo placed in the holds.
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Easily assembling with smooth suface, and without gap when fitted together.
组装简易，表面平滑，组合时没有间隙。
When fitted with check valve, it can also be used in intermittent aeration system.
当曝气器配置止回阀时，还可用于间歇式曝气系统。
When fitted with an otter trawl, invented in 1892, it enabled fishermen to haul in six times the catch of a sailing ship.
当1892年发明的网板拖网被安装上时，它使捕鱼者能够拖动六倍于被帆船捕捉的捕获物。
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