precursor [pri:ˈkɜ:rsə(r)]

例句:

• Radon gas is a precursor to most earthquakes.
  来自SA
• Error is often the precursor of what is correct.
  错误常常是正确的先导.
  
• Real tennis, an ancient precursor of the modern game, originated in the eleventh century.
  室内网球，现代网球运动的古老前身，起源于11世纪。
  
• Error is often the precursor of what is correct, but conceit is the prelude to a fall.
  错误往往是正确的先导, 骄傲是跌跤的前奏.
  
• But Shuttle-LIFE is a precursor to another experiment Phobos-LIFE.
  来自SA
• Inflammation is cited as the precursor to most disease.
  来自SA