This wire has a plastic casing.

这种电线外包塑料.

《简明英汉词典》

In the past, the white plastic casing of the notebook computer is a selling point.

以前, 白色塑料外壳的笔记本电脑是卖点.

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A kind of ringed core pulling mechanism of injection die of plastic casing coupling is introduced.

介绍了塑料管套注射模的环形型芯抽芯机构.

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