gōng rén / zài / hùn níng tǔ / zhōng / tiān jiā / le / shì liàng / de / wài jiā jì / yǐ / tí gāo / gōng chéng / zhì liàng

工人在混凝土中添加了适量的外加剂，以提高工程质量。

Workers added an appropriate amount of additive to the concrete to improve the construction quality.