Compared with rectangular chamber, the axial expansion velocity is small and radial expansion velocity is big in stepped-wall chamber under the same conditions.
和矩形结构相比，同样的工况下，渐扩结构射流轴向速度较小，径向速度较大。
The working chamber is rectangular so as to achieve the maximum of effective volume.
长方形工作室，使有效容积达到最大。
The underground chamber remained a secret for nearly 1, 600 years, until an archaeologist noticed rectangular patches of soft clay in the pyramid's floor—a telltale sign of a grave.
这地下墓室的秘密尘封了近1600年之久，直到一位考古学家发现了在塔内地面上的矩形软土——它泄露了墓穴的秘密。
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