有效的

• It is the law governing princes and pedestrians alike .
  这是一条对王子和流浪汉同样有效的法律。
• We must increase production by using more efficient methods .
  我们必须采用更有效的方法提高产量。
• Methods were tried in case a useful tool should emerge .
  试验了各种方法，以便确定哪一种是有效的。
• This reported result is specific for the particular flight .
  此报道的结果对这次特殊飞行是有效的。
• He claimed that the same drug is also effective in treating headaches .
  他还说这种药对治头痛也是有效的。
• Endoscopy is a useful method of examination in this species .
  内窥镜观察对这些大动物是一种有效的检查方法。
• Any principle derived from the categories are universally valid .
  从各种范畴推出的任何原则都是普遍有效的。
• There was no dependable defense against a modern tank or plane .
  对于现代化坦克或飞机，亦无有效的防御方法。
• A more efficient technique is to sterilize the attracted insects .
  一种比较有效的方法是使被吸引的昆虫绝育。
• The father smeared the face of his son with a powerful unguent .
  父亲用一种非常有效的油膏涂抹在儿子的脸上。