I'm so busy with work, I could use all the help I can get.

He was so relaxed that his hands were behind his back.

He worked as a rear gunner in a fighter plane.

This problem is difficult, and I give up.

This handover is our new project.

The semispinalis thoracis muscle is a deep muscle in the back that supports movement from the neck to the waist.

The multifidus thoracis muscle is a part of the back muscles, mainly involved in stabilizing the spine.

He started exercises to strengthen his sternocleidomastoid muscle.

The lar gibbon, with its long arms, moves quickly from tree to tree.

He is able to both talk and do, and can handle any job.