有时候是这样：弓箭、珍妮纺纱机、计算机的使用是因为他们带来非凡的生产力优势。
Sometimes it is: the bowand arrow, the spinning jenny and the computer were all adopted because theyallowed extraordinary gains in productivity.
那些没有使用“珍妮机”的纺纱工人不但产量低，而且棉纱又卖不出好价钱。
Those who do not use "Jenny machine" spinning workers with low output, but also the inability to sell at a good price of cotton yarn.
手动的珍妮纺纱机是哈格里夫斯在1770年取得专利。
The hand-powered spinning jenny was patented by James Hargreaves in 1770.
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