1.  precursor
2.  forerunner
3.  pioneer
4.  progenitor

• 1. 前驱: forerunner | FWD | pioneer | Precursor
• 2. 前置前驱: Front-engine, front-wheel drive layout | FF | FF layout | Front Driving
• 3. 前驱症状: prodrome | premonitory symptom | antecedent

更多释义

• 1.我退后三步，开始向前驱动。
  I took three steps back and began propelling myself forward.
  dict.yoduao.com
• 2.前驱的干扰和主波形轻微的延迟可以解释这个结构。
  The interference of the precursor and the slightly delayed main waveform can explain this structure.
  dict.yoduao.com
• 3.我们确定，主波包传播的速度不能超越以光速c传播的前驱。
  We are sure that the main wave packet cannot travel faster than the precursor, which travels at c.
  dict.yoduao.com

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