Though book design is subject to the theme of the book, it is not a limited written explanation in words or simple outer wrapping.
书籍的设计虽受制于内容主题，但绝非狭隘的文字解说或简单的外包装。
The wrapped yarn of polyester and spandex takes polyester filament as outer wrapping fiber and spandex as core fiber.
涤氨包缠纱是一种以涤纶长丝为外包纤维，氨纶长丝为芯线的氨纶弹力纱。
The wrapped yarn of polyester and spandex takes polyester filament as outer wrapping fiber and spandex as core fiber.
涤氨包缠纱是一种以涤纶长丝为外包纤维，氨纶长丝为芯线的氨纶弹力纱。
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