he was mature with some common sense.

he was mature with some common sense.
he was mature with some common sense.

he was mature with some common sense.
他很熟知一些常识.

he was mature with some common sense.
对于一些常识，他已经很熟悉的了。

他对一些常识很熟悉

他知道很对常识，挺成熟。
was mature with对于……成熟；
common sense常识