additonal disturbing force

例句：

1. 1. The extra charge will be added to the total cost.
   额外的费用将加到总成本上。
2. 2.We need an additional set of keys for the new car.
   我们需要为新车准备一套额外的钥匙。
3. 3. This book provides additional information about the topic.
   这本书提供了关于该主题的额外信息。