Before flanging auto-body panels, a feasible trimming line should be obtained, otherwise the final part shape after flanging cannot meet the dimensional requirement.

车身零件翻边前一般有修边工序，需要准确的修边线，否则翻边后零件达不到零件尺寸要求。

youdao

After obtaining permits and securing funding, trimming the bridge was the final daunting step of the project.

CNN: San Francisco turns a bridge into art with 25,000 lights