The main failure form of V-round-thread casing, that is, the mechanism of thread connection slipping off, is analyzed in this paper.
本文对V形圆扣套管联接强度失效的主要形式，即套管联接螺纹滑扣(或滑脱)失效的机理进行了分析研究。
2
All birds that fly have round their leg the thread of the infinite.
任何飞鸟的爪子都被无极的丝缕所牵。
3
Lymphatic filariasis is caused by infection with nematodes (round worms) of the family Filariodidea. There are three types of these thread-like filarial worms.