结果表明，喷管潜入结构可有效地降低发动机后封头壁面附近的燃气速度，从而比非潜入发动机有更好的热防护环境；
The results show that the configuration of submerged nozzle can effectively reduce gas velocity near the aft-dome case, and has better heat security environment.
分瓣封头经冷成形后其变形和材料性能有什么变化，能否符合有关规定，过去没有充分数据证明。
There were no data enough to prove if the deformation and the material properties change after cold forming of sectionalized heads and if they can meet the relevant regulations.
一头驴和一只狗一起外出旅行，走了一段路后，他们发现地上有一封密封好的信。
An ass and a dog were on their travels together, and, as they went along, they found a sealed packet lying on the ground. The ass picked it up.
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