1. Then in 1980 the birth of her son added a new element to her work.
    而后，1980年儿子的诞生给她的工作增加了新的成分。"

2. Hydrogen is the lightest element.
    氢是最轻的元素。

3. Abrupt dismissaled, were a potentially dangerous element.
    突然解雇成了潜在的危险因素。

4. Perhaps there is an element of truth in both these pictures,
    也许，这两种都像都有可信之处。

5. Madame Curie will always be remembered as the discoverer of the element radium.
    居里夫人这位镭元素的发现者,将永远为人们所怀念.

6. Radium is a radioactive element.
    镭是个放射性元素。