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请帮助翻译一下啊

Originally made of linen, strings are now made of a lightweight and low-stretch polyethylene that provides a velocity gain to arrows of several feet per second.
一天到晚的迷糊~
原来由亚麻布为原料制成的线现在使用一种重量较轻,伸展性低的聚乙烯为原料,它可以使线以每秒几英尺的速度递增