gōngchéngshī / bǎ / zhè / kuài / jīnshǔ / wānchéng / mǎtíxíng / yònglái / gùdìng / ménkuāng

工程师把这块金属弯成马蹄形，用来固定门框。

The engineer bent this piece of metal into a horseshoe shape to secure the door frame.