不时之须用英语怎么写

From time to time

时之须───The need of time;不───no

You will need the time to orient yourself to your new way of eating.───你需要时间适应新的吃法。

We need time to inform ourselves thoroughly of the problem.───我们需要时间对这个问题有个透彻的了解。

There comes a time when children need to know more than the basic facts of life.───儿童到了一定的时候就需要了解更多的性知识。