以下为句子列表：
英文: Based on theoretical analysis, microbubble drag reduction is due to structure change of turbulent boundary layer caused by the microbubbles.Experiments testify microbubble drag reduction for turbulent boundary layer, as well as bubble size,main flow veloc
中文: 理论分析提出微气泡降阻机理在于其引起湍流边界层结构的变化；实验证明了微气泡对湍流边界层的降阻作用以及气泡尺度、主流速度等对降阻作用的影响；数值方法利用适当的流场模型、湍流模型和差分格式，模拟边界层和气泡数等对降阻的影响。
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英文: The configuration of the diffuser should be designed as a channel to allow the main flow pass through a shock train.
中文: 扩压段的形状应设计成能使主气流通过－系列斜激波串减速的通道。
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英文: The diffuser length should be long enough to ensure the main flow deceleration.
中文: 扩压段应具有一定的长度以保证主气流减速到一定程度。
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英文: The outer mechanical seal shall be located in a recessed housing outside the main flow path of the pump to avoid damage.
中文: 外置机械式密封应该位于泵主流道以外的凹式箱体内，以避免受到破坏。
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