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1.sunspot n. 太阳黑子；雀斑
The broadcast was snapped for a few seconds by the sunspot activity.
太阳黑子运动使广播突然中断了几秒钟。
2.electromagnetic adj. 电磁的
Some people are worried that electromagnetic fields from electric power lines could increase the risk of cancer.
有些人担心输电线的电磁场可能增加致癌几率。
3.ejection n. 喷出；排出物
Radioactivity is the ejection of particles or radiation from the nucleus.
放射性是原子从核中射出粒子或辐射的现象。
4.interval n. 间隔；间距；幕间休息
The process is repeated after a short interval of time.
该程序间隔很短时间就重复一次。
