ānzhuāng / shí / gōngrén / xiān / bǎ / tū'ěr / duìzhǔn / dǐzuò / shàng / de / kǒngwèi / zài / nǐngjǐn / luóshuān

安装时，工人先把凸耳对准底座上的孔位，再拧紧螺栓。

During installation, the workers first aligned the lug with the hole in the base and then tightened the bolt.