1. be not (at all) surprising
小孩子记诵的速度比成年人要快，这一点不足为奇。
It is not surprising that children recite at a different rate from adults.
他向来与别人格格不入，他的想法不被接受是不足为奇的。
He is never going on well with others so that it is nor at all surprising that his idea is not accepted.
2. be all in a day’s work
这个词组从字面看指的是，无非都包含在日常工作中，引申出来的意思就是“司空见惯，不足为奇”。
在野外生火做饭是不足为奇的。
It is all in a day’s work to cook with fire in the wild.
对投资者来说，冒险是不足为奇的。
For investors, risks are all in a day’s work.
