根据传统理论，鳞片变成羽毛的第一步是先拉长，接著长出流苏般的边缘，最后产生有小钩与沟槽的羽小枝。
According to this scenario, scales became feathers by first elongating, then growing fringed edges, and finally producing hooked and grooved barbules.
形式有：链条式、往复式、小鳞片式、大鳞片式、并承接各工业炉窑的燃烧设备。
The form of: chain, reciprocating, small scale type, large scale type, and to undertake various industrial furnace combustion equipment.
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