以下为句子列表：
英文: Closures for collapsible tubes are generally made of plastics materials today, and both thermosetting and thermoplastics types are available with a variety of external shapes and internal threads for screwing tightly on to tube nozzle.
中文: 当今，(装)膏状物小(金属)管的管盖通常由塑料材料制成，不管是热硬化性塑料还是热塑性塑料皆可，它们外型各异，并配有不同的内螺纹以保证管盖与管口能拧紧。
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英文: The seams of the internal threads are eliminated by the reverse rotation while producing few chips，and uniform threads diameter is achieved even though the hole diameter is uneven.
中文: 正转时挤压出内螺纹，逆转时切去内径部的缝隙(有微量碎屑排出)，从而完成加工。下孔径尺寸即使零乱，也可以做出内径尺寸均一的螺纹。
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