extracardial

例句：

1. 1. The extra cardiologist was called in to help with the emergency.
   额外的心脏病专家被叫来帮助处理紧急情况。
2. 2. The extra workload made it difficult for him to balance his studies and work.
   额外的工作量使他难以平衡学习和工作。
3. 3. The extra expense of buying a new car is not worth it.
   购买新车的额外费用不值得。