gōng chéng shī / zǐ xì / jiǎn chá / le / měi yī gè / jī jiàn / què bǎo / tā men / ān zhuāng / zhèng què

工程师仔细检查了每一个机件，确保它们安装正确。

The engineer carefully inspected every component to ensure they were installed correctly.