ring core

Meanwhile, core-spun yarn was made by ring spinning frame, which involves a core of cotton yarn with a covering of PVA fiber.

又通过环锭细纱机将水溶性PVA包覆于棉纱上，制成水溶性PVA包覆棉芯的包芯纱。

Ring rolling mill is the core equipment of the rolling technology.

轧环机是轧制技术的核心设备.

Swiss core, 2.4-inch high-definition screen, the band ring for, the card.

瑞芯微方案, 2.4寸 高清晰 屏, 带外响, 可插卡.

Metal cock ring soft seat surface pressure to the bearing surfaces, such as the valve core and valve seat is concentric ring surface can be a double tight closure.

金属旋塞表面压向阀座环软支座表面，如阀芯和阀座环表面是同心的，就能得到双重严密的关闭。

There are two kinds of ball cores: Cross ball core and three-ring type ball core.

球芯有两种: 十字型球芯和三环型球芯.