主帆是由真正的篷布手工切割和缝制而成的。
本文介绍一种全凭手工切割大口径锗单晶的切片方法。
The method to slice large diameter Ge crystal by hand is shown.
现代切割技术有别于传统手工切割技术，它是基于现代计算机信息技术的。
Modern incision technology based on computer and information technology differs from traditional one.
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