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莉莉:
Wow! You are much skinnier since the last time I saw you. 
噢.你比上次见面苗条多了.
露西:
I have lost about five kilos.
我减了十斤.
莉莉:
How do you do it?
你怎么做到的?
露西:
I am on a diet and exercise everyday.
我节食并且每天运动.
莉莉:
What's the secret?
有什么秘诀吗?
露西:
The secret is constancy of purpose.
秘诀就是坚持不懈.