a sincere friend的用法和样例：
- You'll have a sincere friend in me for even.
- Who that is a sincere friend to it can look with indifference upon attempts to shake the foundation of the fabric?
- Is to help others, the others given a grateful heart; is aware of a new friend, a sincere friend to smile.
- The professional services industry, a sincere friend to the majority of visitors to Beijing to provide special airfares Novosibirsk.
- Hoped you are a sincere friend, is earnest to the sentiment, twopeople confess together in can each other, each other looks afteropposite party.