The design basis includes the main parameters, the type of vessel, the design of structure and the calculation of the main pressureelements.
着重介绍了设计中主要参数的确定，容器类别的划分，主要受压元件的计算和结构设计。
2
Now in this particular reaction, I've got hydrogen gas, iron solid. Those already are elements in their most stable forms at room temperature and pressure.
特定的反应中，我有氢气，固态铁，这些都已经是，处于室温和常压下，最稳定的元素单质。
3
In reactor 1, and later in reactor 3, steam contaminated with some radioactive elements was allowed out of the pressure vessel and into the larger containment vessel that surrounds it.