gōng / zuò / rén / yuán / chuān / dài / fáng / hù / zhuāng / bèi / hòu / cái / kāi / shǐ / chǔ / lǐ / yè / ān

工作人员穿戴防护装备后，才开始处理液氨。

The staff began handling the liquid ammonia only after putting on protective equipment.