it is uncertain whether造句

• It is uncertain whether / if he will succeed or fail
  他成功还是失败，还不能肯定。
• In particular , it is uncertain whether the new functional value of the compensation area can really be doubled to that of the existing fishponds or actually to what extent the proposed enhancement measures would be effective
  经强化后的湿地功能是否真的能倍增，或实际功能多少仍属未知之数。
• At current costs it is uncertain whether the system will pay for itself within an acceptable period , though future uncertainties about water supply and demand may make such systems much more attractive
  按现行费率是否系统将在一个可接受的时期内为系统本身付费是不确定的，尽管将来对水供应与需求的不确定可以使这样的系统更有吸引力。
• The appeal followed an investigation into a case of liver damage involving a 61 - year - old man who had taken the medicine in question obtained from the mainland for insomnia . however , it is uncertain whether his liver damage was caused by the product
  ?生署是在跟进一宗肝功能受损的个案后作出上述呼吁，该个案涉及一名六十一岁男士，他因失眠而服用从内地购得的这种中成药，但未能确定此产品是否引致该男士肝功能受损。
• For soft inclusion , the sif of crack with inclusion is smaller than without inclusion , when the radius of the crack approachs the radius of the inclusion . and with the radius of crack increasing , it is uncertain whether the sif of crack with inclusion is smaller than without inclusion . but they will be approaching
  对于软夹杂，当裂纹半径接近夹杂半径时，含夹杂时的应力强度因子比没有夹杂时要小，而当裂纹半径进一步增大时，有无夹杂时应力强度因子大小关系是不确定的，但随着裂纹半径的不断增大，二者不断接近。