1.  valid
2.  efficacious
3.  effective
4.  effectivity

• 1. 有效: Effective | in force | in effect | validity
• 2. 有效性: effectiveness; validity; efficacy | validity | effectiveness | Availability
• 3. 有效数字: significant figure | significant digit | effective figure | valid figure

更多释义

• 1.这个特价优惠月底前有效。
  This special offer is valid until the end of the month.
  dict.yoduao.com
• 2.所有这些方法都同等有效。
  All these techniques are equally effective.
  dict.yoduao.com
• 3.这药已证实是有效的。
  It has been demonstrated that this drug is effective.
  dict.yoduao.com

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