n. a quad with a square body
n. a linear unit (1/6 inch) used in printing
[计] 媒体用毕符
[化] 射气
1. EM stands for "electromagnetic," which is important in physics.
EM代表“电磁”，在物理学中很重要。
2. The EM spectrum includes visible light and radio waves.
EM光谱包括可见光和无线电波。
3. She studies EM technology to improve communication systems.
她研究EM技术以改善通信系统。