Scientists at Harvard and MIT have invented self-folding sheets of composite material that can flex themselves into toy boats, tents and even paper airplanes.

哈佛大学和麻省理工学院的科学家受折纸艺术启发，发明出一种复合材料薄片，能自动折出玩具船、帐篷甚至是纸飞机。

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Because the single fiber composite material is the special case of the hybrid fiber composite material, the calculation formulae in this paper can also apply to the single fiber composite material.

由于单一纤维复合材料是混杂纤维复合材料的特例，文中给出的计算公式同样适用于单一纤维复合材料。

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This machine applicable to a variety of packaging bags, multi-layer composite membrane made of prefabricated bags, paper bags can be applied.

本机可适用多种包装袋，多层复合膜制成的预制袋、纸袋均可应用。

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