This is the caisson block, which was made to prevent people from a nuclear danger.
这个是沉箱块，这是用来防御核危机的。
The hydrostatic balance of special shaped caisson injected with water is a space force system.
异型沉箱的箱格灌水静水平衡计算属空间平行力系的计算问题。
The hydrostatic balance of special shaped caisson injected with water is a space force system.
异型沉箱的箱格灌水静水平衡计算属空间平行力系的计算问题。
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