be famous at

• 是； 善于

be famous at的用法和样例：

例句

1. Money is thought to be the root cause of all evils.
   金钱被认为是万恶之源。
2. Honesty will never be at a discount.
   诚实永远是受欢迎的。
3. The boy is good at doing a sum in his head.
   这男孩善于心算。
4. We should be good at learning from each other.
   我们应该善于互相学习。