gōng / chéng / shī / cè / shì / cái / liào / de / yán / xìng / yǐ / què / bǎo / tā / zài / jiā / gōng / shí / bù / róng / yì / duàn / liè

工程师测试材料的延性，以确保它在加工时不容易断裂。

The engineers test the material's ductility to ensure that it does not break easily during processing.