求翻译：cations in submerged tunnels, gravity seawalls, shear walls for tall buildings and blastwalls for containing explosions. It is essential是什么意思？

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cations in submerged tunnels, gravity seawalls, shear walls for tall buildings and blastwalls for containing explosions. It is essential

问题补充：

匿名	2013-05-23 12:21:38 阳离子在水下隧道，重力海堤，剪力墙的高楼大厦和blastwalls含有爆炸。它是必不可少的

匿名	2013-05-23 12:23:18 阳离子在水中隧道、重力海堤、剪切墙的高楼和blastwalls遏制爆炸。它是至关重要

匿名	2013-05-23 12:24:58

匿名	2013-05-23 12:26:38

匿名	2013-05-23 12:28:18

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