皮肤是保护身体免受伤害的外部器官。

The skin is an external ___organ that protects the body from harm.

她注册成为器官捐赠者，以便在死后拯救生命。

She registered as an ___organ donor to save lives after her death.

先进的医疗技术使得人体中几乎任何器官的移植成为可能。

Advanced medical technology enables the transplant of almost any ___organ in the human body.