她是一位定期献血者。

She is a regular blood ___donor.

器官捐赠者的无私行为可以拯救无数生命。

The selfless act of an organ ___donor can save countless lives.

成为一名骨髓捐赠者需要勇气和极大的利他精神。

Becoming a bone marrow ___donor requires courage and immense altruism.