After a traumatic loss, it's not uncommon from the outside world.

在经历过创伤性事件后这样的情况很常见。

The research involved volunteers with a condition known as volumetric muscle loss, the traumatic loss of skeletal muscle, usually because of an injury, most often seen in military personnel.

该研究涉及患有体积肌肉损失的志愿者，骨骼肌的创伤性损失， 通常是由于受伤， 最常见于军事人员。