1.  step by step
2.  Grad .
3.  gradatim

• 1. 逐步: step-by-step | step by step | successive steps
• 2. 逐步地: step by step | little by little | gradually | stage by stage
• 3. 结构逐步优化: structural improvement

更多释义

• 1.她的症状逐步恶化。
  Her symptoms became progressively worse.
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• 2.这场交战逐步扩大为全面战争。
  The fighting escalated into a full-scale war.
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• 3.警方正逐步摸清那次事件的经过。
  The police are building up a picture of the incident stage by stage.
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