ring-shaped 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。

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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.

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

轧环机是轧制技术的核心设备.

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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。

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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.

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