be insufficient to

• 不足以； 不能胜任

be insufficient to的用法和样例：

例句

1. My income is not sufficiently great to support us.
   我的收入不足以供养我们。
2. His thin clothes will be inadequate in the winter.
   他的衣服单薄冬天不足以御寒。
3. A man of his size is not equal to the job.
   他这般能耐的人不能胜任这种工作。
4. I don't feel up to such a long journey.
   我不能胜任这样的长途旅行。