Further research is needed into this streak of light - and why the cracking sound is so loud.
为什么会出现这道白光，以及为什么掰指关节会发出这么大的声音，还有待进一步研究。
2
The cracking produced on the light board wall body has become a common failure of quality. It has influence upon its spread and application.
轻质条板墙体产生的裂缝，已成为施工中的质量通病，使轻质条板推广应用受到严重影响。
3
DCC catalyst consists of a modified mesopore zeolite with pentasil structure for primary product of naphtha range to undergo secondary cracking for producing light olefins.