"Pregnant women and mothers who are breastfeeding must not be allowed to work in a unit where mercury is present," states one official rulebook.
“怀孕妇女和实行母乳喂养的母亲绝不应被允许在有水银接触的单位工作，”一本官方的规则书如是说。
2
The paper introduces the principle, structure and used effects of the mercury waste gas purification unit.
本文介绍汞废气净化处理装置的原理、结构及使用效果。
3
One end of the cable is permanently connected to the enclosed mercury switch and the entire assembly is encapsulated to form a completely watertight and impact resistant unit.