A contract subject to a condition precedent becomes effective once such condition is satisfied.附生效条件的合同，自条件成就时生效。
Voter demand that the candidate keep the pledge make as a condition precedent to election.选民们要求把候选人对他们誓言的履行作为选举的先行条件。
Voters demanded that the candidates keep the pledges made as a condition precedent to election.选民们要求把候选人对他们誓言的履行作为选举的先行条件。