| 摘要 |
The cover has a front (10) and back part that are made of a fabric with good aeration. They are joined on one side by a strip (12) of transparent plastics material. The front and back parts are made of a fabric with at least 50% natural material, such as cotton, linen, wool, or silk. They can be made of pure cotton. The front part has a central vertical opening closed by a slide clasp fastener (14).
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