它开始来来回回地飞，每盘旋一次都飞得更高。空气越来越冷，脚下远处传来一阵鹰啼。
He began flying to and fro, getting higher at each turn. The air grew colder, and they heard the call of eagles far below them.
介绍了自行车单级飞轮飞壳冷滚轧成形工艺过程以及轧辊的结构、夹具形式和轧机参数。
The process of cold rolling forming for outer ring of single freewheel of bicycle and the structure of roller and jig, and the parameters for rolling machine have been introduced.
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