1.  foreboding
2.  omen
3.  sign
4.  portent
5.  indication

• 1. 先兆: precursor | aura | omen | prodrome
• 2. 先兆流产: threatened abortion | miscarriage prevention | Threatened miscarriage
• 3. 先兆子痫: pre-eclampsia | eclampsia | preeclampsia

更多释义

• 1.她忽视了一些先兆症状，也没有检查病人的病历。
  She ignored the warning signals and did not check the patient's medical notes.
  dict.yoduao.com
• 2.那被认为是一种不幸的先兆。
  It is said to be an omen of misfortune.
  dict.yoduao.com
• 3.那座桥在没有任何先兆的情况下坍塌了。
  The bridge collapsed without (any) warning.
  dict.yoduao.com

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