Translation

• voice (as sth that may be described as husky 沙啞|沙哑[sha1ya3] or deep 低沉[di1chen2] etc)
• (physics) sound ray

Examples

• 他压低声线，喃喃自语地说了些话。
  He muttered something under his breath.
• 我被她甜美的声线迷倒了。
  I was fascinated by her sweet voice.