The intellectual environment has a significant influence on the mental development of the children.

知识环境对孩子智力的发展有着重大的影响。

intensive mental effort.

高强度的智力活动。

The mental state that had created her psychosis was no longer present.

导致她精神错乱的那种心理状态已经不见了。

mental health problems.

心理健康问题。

Practise mental arithmetic when you go out shopping.

外出购物时练习一下心算。