The optimism design of thickness for this cladding material is helpful to improve the performance of thermal shock resistance.
对硬质覆层材料的厚度进行优化设计有助于其抗热震性能的提高。
A top design official at the time, Boris Chertok, wrote in his memoirs that "Judging by modern standards of rockets reliability, we had no reasons for optimism by April 1961."
一位高级设计师Boris Chertok在他的回忆录中写到“以现代火箭可用性来评估的话，我们实在没有理由对1961年4月那次发射那么乐观。”
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