Sentence examples for life span is difficult from inspiring English sources

Besides, accurate estimation of menstrual life span is difficult because menstrual cycles vary within and between women, and not all menstrual cycles are ovulatory.

However, it is very difficult to directly detect ROS in the brain because they are extremely reactive and their life span is very short.

The median life span is 41years.

Needles die when their life span is up.

My life span is congruent with that of Ms. magazine.

Our life span is no shorter than yours.

Through the Web, the life span is extended".

The rats' typical life span is 5 to 12 months.

The project life span is taken as 25 years.

The maximum life span is 2 to 2.5 years.

Their life span is usually 1 2 years.