后来，羽毛开始淡出人们的视野，因为金属笔尖出现了。 这可谓是一个进步，因为用来写字的羽毛磨损得很快。
The feather went out with the introduction of a metal nib which was an improvement because skritching along with a feather tended to wear it out pretty quickly.
根据另一种理论，由于金属制造技术的进步，短剑不必再为保持它的强度而刻意造得那么短了。
Another theory is that as metalworking technologies advanced, the gladius no longer had to be short if it wanted to maintain its strength.
介绍了水口山有色金属集团有限公司近年来在金银生产的流程完善和技术进步方面所做的工作及取得的成效。
The paper presents the works done and success achieved by Shuikoushan Nonferrous Metal Group Corporation concerning the process perfection and technical progress in gold and silver production.
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