1. Rontgen's having discovered X-rays contributed much to world's science. 
   伦琴发现了x射线对世界科学贡献很大。
2. To be equivalent to 
   相当于
3. equivalent form of value 
   等价形式
4. an equivalent counterbalancing weight. 
   一种称重物的平衡物。
5. An adult male bovine mammal. 
   公牛成熟的雄牛

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