She named the other radium. She measured the amount of radioactivity, an atomic property, and felt that the radioactivity was proportional to the amount of the element.
她测量了这两个元素放射性的总量和原子性质，感觉到物质的放射性是同放射性元素的总量成比例的。
2
A: Historically, nature has been a wild element that human beings have felt the need to subdue and control.
答：历史上，自然一直被视为是一种狂野的力量，人类觉得一定要征服、控制自然。
3
Press styrofoam element into the opening until it is felt to engage.