left-hand elliptically polarized wave

例句：

1. 1.The left-hand side of the spectrum is where most of the energy is concentrated.
   频谱的左侧是能量集中的地方。
2. 2. The left-hand side of the spectrum contains the fundamental frequencies.
   频谱的左侧包含了基本频率。
3. 3.The left-hand side of the spectrum is often used for transmitting signals.
   频谱的左侧通常用于传输信号。