1.  omen
2.  premonition
3.  forewarning
4.  foreshadow
5.  forerunner

• 1. 前兆: auspice | Precursor | premonition | forerunner
• 2. 地震前兆: earthquake precursor | omen of earthquake | precursory information of earthquake
• 3. 火山喷发前兆: forerunning phenomena | eruption symptom

更多释义

• 1.他说这次交易不应该被看作是合并的前兆。
  He said that the deal should not be seen as a precursor to a merger.
  dict.yoduao.com
• 2.巴氏涂片可以检测异常细胞，这些细胞是癌症的前兆，可以使用激光等技术来摧毁它们。
  Pap smears work by detecting abnormal cells that are cancer precursors and that can be destroyed using techniques like lasers.
  dict.yoduao.com
• 3.那些云彩是雨的前兆。
  Those clouds mean rain.
  dict.yoduao.com

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