在理论上

• Thereby on theory prove : 1
  从而在理论上证明了： 1
• His proposition is good in theory but cannot be put into practice
  他的建议在理论上可以,但不能付诸实现。
• His proposal is all right in theory ， but cann ' t be put into practice
  他的建议在理论上可以,但不能付诸实现。
• His suugestion is feasible in theory , but can ' t be put into practice
  他的建议在理论上可以,但不能付诸实现。
• His advice is ok in the abstract , but it can not be put into practice
  他的建议在理论上可以,但不能付诸实现。
• His suggestion is feasible in theory , but can ' t stand in the operation
  他的建议在理论上可以,但不能付诸实现。
• These are only theoretical
  这只是在理论上存在的
• His suggestion can be used in theory , but can not used in the real world
  他的建议在理论上可以,但不能付诸实现。
• Theoretically how to choose kernel function remains unsolved
  在理论上，怎样选择核函数，还是一个未解决的问题。
• That is the amount considered to be enough , at least theoretically
  一般认为，至少在理论上，这个数额已经足够。