當這些平時的整備工作做好，就會在地震發生時發揮效果，減少傷亡。

當這些平時的整備工作做好，就會在地震發生時發揮效果，減少傷亡。

結果 (英文) 1:

When these preparedness work usually do a good job, it will play in the event of an earthquake effect, reduce casualties.

結果 (英文) 2:

When these usual preparation work is done, it will play an effect in the event of an earthquake, reducing casualties.

結果 (英文) 3:

When these peacetime preparations are well done, they will play a role in the earthquake and reduce casualties.