The Technological Process of Umbrella
By Flora Lee • 07/2 @ 7:35 • The Technological Process of Umbrella已关闭评论
Umbrellas are generally divided into three categories,for rainy days, for sunny days, and both for rainy and sunny.On materials, oil paper, tarpaulin or plastic cloth is usually used. With the improvement of the quality in daily necessities, umbrellas are not
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