本文阐述了脉冲燃烧器稳定运行的概念，分析了评价脉冲燃烧质量的主要指标。

The concept of stable operation of pulse combustor is illustrated in this paper. The principal criteria of the quality of pulse combustion is also analysed.

youdao

棕矮星是一些由炽热的气体组成的球，它们缺乏像行星那样足够的质量来进行氢的燃烧。

Brown dwarfs are balls of warm gas that lack the mass necessary to fuse hydrogen at their core, as stars can.

youdao

不过大多数恒星都没有足够的质量以产生燃烧重元素所需的压力与热能，所以核聚变与热能产生过程都停止了。

But most stars are not massive enough to create the pressures and heat necessary to burn heavy elements, so fusion and heat production stop.

youdao