additional period

例句：

1. 1.The additional information will help us make a better decision.
   额外的信息将帮助我们做出更好的决定。
2. 2.We need to add an extra set of keys to the lock.
   我们需要在锁上额外添加一套钥匙。
3. 3. The company added an additional department to its team.
   公司增加了一个额外的部门到其团队。