1.  It is perhaps a technicality whether a certain part of the storage space is to be regarded as internal or external.

2.  Anthrogenesis derives its cells by removing blood from the placenta and keeping a certain part of the placenta alive, though the company declined to give its anatomical name.

3.  A chi-gong move involves intense concentration in which a monk focuses on a certain part of his body to avoid pain and injury.

4.  Finding the gene for a disease is a bit like tracing a glitch in a car to a certain part.

5.  For the sake of self-survival, you have to amputate a certain part of yourself.

6.  Instead of being confined to a certain part of the lake, you are now free to roam the water.

7.  Public education was lagging, the inner city was crumbling and it seemed that a certain part of the city was being left to rot.

8.  She also may start holding herself before she urinates or squat down in a certain part of the room before having a bowel movement.

9.  The most difficult factor I had to weigh in making my decision to leave college was knowing that I would be leaving a certain part of my life behind.

10.  The wind in the pine trees is a sound that is like a signature on a certain part of my life.