only if

副词 only if:

1. never except when
   同义词：only, only when

1. Only if I get a job will I have enough money to go to school.
   我只有找到了工作才有足够的钱上学。
2. I can buy the house only if a mortgage for 2000 dollars is available.
   只有拿到两千美元的抵押贷款，我才买得起那栋房子。
3. A compound proposition that has components joined by the word and or its symbol and is true only if both or all the components are true.
   综合命题由和或其符号所连接的子句组成的复合命题，只有当所有子句为真时，该句才为真
4. The company will succeed only if it have sufficient backing.
   只有当该公司获得足够的资助，它才会成功。