Numerical simulations of the transpiration cooling thruster with a four-section porous wall show that the design reduces of the required coolant flow by half.
对分四段结构喷管的数值模拟的结果表明，相比不分段而言分段结构可减少一半冷却剂流量。
2
In this section , you will hear three recordings of lectures or talks followed by three or four questions.
在这部分，你将听到三段讲座或演讲的录音，每段之后回答三或四个问题。
3
The full railway, which includes 72-kilometers section through Beijing, will be completed in four and a half years.