His jet needed no propellers. It was a tube, open at both ends.

他的喷气流不需要螺旋桨，而是由一个两端开口的管子来实现。

youdao

The experiment results show that observing jet appearance with the double reflecting mirrors system is feasible as long as the vacuum of the glass tube can meet the requirement of experiment.

实验结果表明，只要有机玻璃管的真空度能够满足要求，采用双反射镜成像系统来观测射流的形貌是可行的。

youdao

Aimed at the jet noise which is induced by the expand structure and tail tube in the resistant muffler, a finite element model at low Mach number was developed.

针对抗性消声器中扩张结构和尾管引起的射流噪声问题，建立了低马赫数射流噪声有限元分析模型。

youdao

When the passengers for D301 reached the platform, they encountered a vehicle that looked less like a train than a wingless jet: a tube of aluminum alloy, a quarter of a mile from end to end, containing sixteen carriages, painted in high-gloss white with blue racing stripes.

NEWYORKER: Boss Rail