The bent frame system and portal frame system are often used for industrial mill buildings.
在工业厂房中，常用的结构体系有排架体系和刚架体系。
The fenders were gone, the frame was bent and both pedals were missing.
自行车前后挡板都没了，车架弯了，两个脚踏板也没了。
The fenders were gone, the frame was bent and both pedals were missing.
自行车前后挡板都没了，车架弯了，两个脚踏板也没了。
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