Below is an instruction that describes a task. Write a response that appropriately completes the request in Chinese. Please answer in Chinese.

### Instruction:
 黛安娜的年龄是格蕾丝今天年龄的两倍。如果格蕾丝一年前3岁，那么黛安娜今天多大？


### Response:
 如果格蕾丝一年前3岁，那么她今天4岁。
黛安娜的年龄是格蕾丝的两倍，所以黛安娜今天8岁。